71/100RP Score
Ranked #1 because of specialty focus and its Google rating: listed on Google as “Psychologist”, 3.5★ from 6 Google reviews.
Based on 6 of 8 factors; recency and availability not yet collected.
Best Psychologists in O'Fallon, MO (2026)
83 psychologists ranked by RP ScoreUpdated 0 paid placements in this rankingHow we rank →
The short answer
- 1
Best overall in O'Fallon: Cavins Rick, RP Score 71/100; 3.5★ from 6 Google reviews.
- 38
Most-reviewed: LifeStance Therapists & Psychiatrists Saint Peters, 469 Google reviews at 4.4★, the most of 83 ranked; ranked #38.
Rankings can't be bought. Psychologists can't pay to change their rank or score. How we rank
83 O'Fallon psychologists are ranked here by RP Score, from eight published factors. 18 open Saturdays and 4 open Sundays, based on posted hours. The median Google rating is 4.4★ across 83 rated practices.
Top 10 psychologists in O'Fallon at a glance
Ranked by the RP Score from public listing data, not by treatment outcomes; Sponsored placements are shown separately and never change rank.
| Rank | Business | RP Score | Google rating | Based in | Hours | Best for |
|---|---|---|---|---|---|---|
| 1 | Cavins Rick | 71 | 3.5★ (6) | Lake Saint Louis, 4 mi away | — | Overall |
| 2 | Florian Psychological Services | 71 | 3.7★ (3) | Lake Saint Louis, 4 mi away | — | — |
| 3 | Mercy Clinic Child and Adolescent Psychiatry - Technology Drive | 68 | 4.0★ (4) | O'Fallon | — | — |
| 4 | James Adams, Psychiatric Nurse Practitioner | 68 | 5.0★ (48) | Saint Peters, 5 mi away | — | — |
| 5 | Ursula W. Marsh, PhD | 65 | 4.0★ (4) | Wentzville, 10 mi away | — | — |
| 6 | Thripura Thirtala, Psychiatrist | 64 | 3.8★ (38) | Saint Peters, 6 mi away | — | — |
| 7 | Minds in Progress | 63 | 5.0★ (3) | Saint Charles, 8 mi away | — | — |
| 8 | Dr. Malinda Dale | 62 | 3.7★ (3) | Chesterfield, 14 mi away | — | — |
| 9 | Thomas Lantsberger | 62 | 5.0★ (3) | Chesterfield, 14 mi away | — | — |
| 10 | Marble Wellness | 61 | 5.0★ (29) | O'Fallon | Sat · Evenings | — |
The 83 best psychologists in O'Fallon, ranked
Ordered by RP Score, a 0–100 score from eight published factors. Paid placement never changes the order.
Ranked by the RP Score from public listing data, not by treatment outcomes; Sponsored placements are shown separately and never change rank.
Based in Lake Saint Louis, 4 mi away
71/100RP ScoreRanked #2 because of specialty focus and its Google rating: listed on Google as “Psychologist”, 3.7★ from 3 Google reviews.
Based on 6 of 8 factors; recency and availability not yet collected.
Based in O'Fallon
68/100RP ScoreRanked #3 because of specialty focus and its Google rating: listed on Google as “Psychologist”, 4.0★ from 4 Google reviews.
Based on 7 of 8 factors; recency not yet collected.
Based in Saint Peters, 5 mi away
68/100RP ScoreRanked #4 because of specialty focus and its Google rating: listed on Google as “Psychologist”, 5.0★ from 48 Google reviews.
Based on 7 of 8 factors; recency not yet collected.
Based in Wentzville, 10 mi away
65/100RP ScoreRanked #5 because of specialty focus and its Google rating: listed on Google as “Psychologist”, 4.0★ from 4 Google reviews.
Based on 6 of 8 factors; recency and availability not yet collected.
Based in Saint Peters, 6 mi away
64/100RP ScoreRanked #6 because of specialty focus and its Google rating: listed on Google as “Psychologist”, 3.8★ from 38 Google reviews.
Based on 7 of 8 factors; recency not yet collected.
Based in Saint Charles, 8 mi away
63/100RP ScoreRanked #7 because of specialty focus and its Google rating: listed on Google as “Child psychologist”, 5.0★ from 3 Google reviews.
Based on 7 of 8 factors; recency not yet collected.
Based in Chesterfield, 14 mi away
62/100RP ScoreRanked #8 because of specialty focus and its Google rating: listed on Google as “Psychologist”, 3.7★ from 3 Google reviews.
Based on 6 of 8 factors; recency and availability not yet collected.
Based in Chesterfield, 14 mi away
62/100RP ScoreRanked #9 because of specialty focus and its Google rating: listed on Google as “Psychologist”, 5.0★ from 3 Google reviews.
Based on 6 of 8 factors; recency and availability not yet collected.
#10 Marble Wellness
Based in O'Fallon
61/100RP ScoreRanked #10 because of its Google rating and proximity: 5.0★ from 29 Google reviews, based in O'Fallon.
Based on 7 of 8 factors; recency not yet collected.
Based in Chesterfield, 15 mi away
61/100RP ScoreRanked #11 because of specialty focus and its Google rating: listed on Google as “Child psychologist”, 4.3★ from 4 Google reviews.
Based on 6 of 8 factors; recency and availability not yet collected.
Based in Ballwin, 16 mi away
61/100RP ScoreRanked #12 because of specialty focus and its Google rating: listed on Google as “Psychologist”, 5.0★ from 4 Google reviews.
Based on 6 of 8 factors; recency and availability not yet collected.
Based in St. Louis, 17 mi away
60/100RP ScoreRanked #13 because of specialty focus and its Google rating: listed on Google as “Psychologist”, 4.5★ from 11 Google reviews.
Based on 6 of 8 factors; recency and availability not yet collected.
#14 Ari Holtz, PhD
Based in Ballwin, 16 mi away
60/100RP ScoreRanked #14 because of specialty focus and its Google rating: listed on Google as “Psychologist”, 3.7★ from 3 Google reviews.
Based on 6 of 8 factors; recency and availability not yet collected.
Based in Wentzville, 10 mi away
60/100RP ScoreRanked #15 because of specialty focus and its Google rating: listed on Google as “Psychologist”, 3.0★ from 4 Google reviews.
Based on 7 of 8 factors; recency not yet collected.
Based in Saint Charles, 12 mi away
60/100RP ScoreRanked #16 because of specialty focus and its Google rating: listed on Google as “Psychologist”, 4.0★ from 14 Google reviews.
Based on 7 of 8 factors; recency not yet collected.
Based in Creve Coeur, 16 mi away
59/100RP ScoreRanked #17 because of specialty focus and its Google rating: listed on Google as “Psychologist”, 3.0★ from 4 Google reviews.
Based on 6 of 8 factors; recency and availability not yet collected.
Based in Ballwin, 16 mi away
59/100RP ScoreRanked #18 because of specialty focus and its Google rating: listed on Google as “Psychologist”, 3.6★ from 11 Google reviews.
Based on 7 of 8 factors; recency not yet collected.
Based in St. Louis, 15 mi away
59/100RP ScoreRanked #19 because of specialty focus and its Google rating: listed on Google as “Psychologist”, 3.5★ from 8 Google reviews.
Based on 7 of 8 factors; recency not yet collected.
Based in Creve Coeur, 17 mi away
59/100RP ScoreRanked #20 because of specialty focus and its Google rating: listed on Google as “Psychologist”, 4.2★ from 5 Google reviews.
Based on 6 of 8 factors; recency and availability not yet collected.
Based in Saint Peters, 6 mi away
59/100RP ScoreRanked #21 because of its Google rating and specialty focus: 4.7★ from 27 Google reviews, listed on Google as “Mental health service”.
Based on 7 of 8 factors; recency not yet collected.
Based in O'Fallon
59/100RP ScoreRanked #22 because of its Google rating and proximity: 3.6★ from 17 Google reviews, based in O'Fallon.
Based on 7 of 8 factors; recency not yet collected.
Based in St. Louis, 18 mi away
59/100RP ScoreRanked #23 because of specialty focus and its Google rating: listed on Google as “Child psychologist”, 5.0★ from 3 Google reviews.
Based on 6 of 8 factors; recency and availability not yet collected.
Based in St. Louis, 18 mi away
58/100RP ScoreRanked #24 because of specialty focus and its Google rating: listed on Google as “Psychologist”, 4.0★ from 4 Google reviews.
Based on 6 of 8 factors; recency and availability not yet collected.
Based in O'Fallon
58/100RP ScoreRanked #25 because of its Google rating and proximity: 4.8★ from 29 Google reviews, based in O'Fallon.
Based on 7 of 8 factors; recency not yet collected.
Psychologists ranked #26 to #50
#1 to #25 are shown in full above. Here are #26 to #50, in RP Score order; each links to its profile. We publish the top 50 of 83 ranked psychologists here; the rest are on their profiles.
Also serving O'Fallon
20 more psychologists within 20 mi that we can't rank yet: too few reviews, or a specialty we couldn't confirm. Listed A to Z.
| Business | Google rating | Distance |
|---|---|---|
| Brown William B | 4.4★ (7) | In O'Fallon |
| Dr. Howard J. Ilivicky, MD | 4.0★ (20) | In O'Fallon |
| Dr. John P. Canale, MD | 4.5★ (18) | In O'Fallon |
| Dr. Scott J. Arbaugh, MD | 3.7★ (31) | In O'Fallon |
| Enyart Carla J | 5.0★ (6) | In O'Fallon |
| Fine Joe Casac | 3.4★ (8) | In O'Fallon |
| Generations Counseling | 4.5★ (8) | In O'Fallon |
| Geries Shaheen MA, LPC, NCC | 5.0★ (8) | In O'Fallon |
| Good Living Counseling | 5.0★ (4) | In O'Fallon |
| Harmony Christian Counseling, LLC | 4.0★ (4) | In O'Fallon |
| Lakeside Counseling Services | 5.0★ (6) | In O'Fallon |
| Megan Chapman, MA, LPC | 5.0★ (4) | In O'Fallon |
| Nathan E. Lundin, LPC, CSAT-S | 4.0★ (4) | In O'Fallon |
| Proactive Behavioral Health Solutions | 4.2★ (10) | In O'Fallon |
| Psychiatric Care and Research Center | 3.2★ (35) | In O'Fallon |
| Ryan Espenschied, MA, MATS, LPC | 4.4★ (13) | In O'Fallon |
| Shannon Roberson, LPC | 3.5★ (8) | In O'Fallon |
| Side by Side Wellness LLC | 4.4★ (7) | In O'Fallon |
| Unlimited Potential Counseling & Education Center | 3.8★ (16) | In O'Fallon |
| Willow Tree Center | 3.5★ (11) | In O'Fallon |
How we ranked O'Fallon psychologists
We scored 83 O'Fallon psychologists on eight factors, weighted as shown. A practice is ranked when its specialty is confirmed and it has 3 or more Google reviews or a claimed profile. A practice with no Google reviews scores zero on rating, review volume and recency. Other unknown factors are left out, not counted as zero. Scores last refreshed November 9, 2026.
Paid placement never changes a rank or score. Sponsored businesses are paid, labelled, limited to 3 and shown above the ranking, outside it.
| Factor | Weight | Computed from | In O'Fallon data |
|---|---|---|---|
| Reputation | 25% | Google star rating, adjusted for how many reviews back it | Measured |
| Review volume | 5% | Number of Google reviews, compared with the most-reviewed practice on the list | Measured |
| Recency | 5% | Share of Google reviews from the last 12 months | Not yet collected |
| Availability | 10% | Weekly open hours, Saturday, Sunday, and round-the-clock or same-day availability | Measured |
| Specialty focus | 25% | How clearly the practice does this specialty (its Google category and name) | Measured |
| Proximity | 15% | Based in the city scores highest, less the farther away it is | Measured |
| Claimed profile | 10% | The practice has claimed its Ranked Psychologists profile (free or paid earn the same) | Measured |
| Partnered | 5% | The practice links to Ranked Psychologists from its own website with our badge, checked periodically | Measured |
How to choose a psychologist
- Check the license with the state or provincial board that issued it; most boards publish a free online lookup.
- Make sure they regularly work with clients who have your concern, and ask what approach they use and why.
- If you may need testing as well as therapy (for example for ADHD or memory concerns), ask whether the practice does assessments itself.
- Ask about fees, insurance and the cancellation policy before the first session. In the US, if you are uninsured or paying yourself, you can ask for a good faith estimate of expected charges.
- Check practical fit: in-person or online sessions, evening times, and how soon they have an opening.
- After a few sessions, ask yourself whether you feel heard. Changing to a different provider is common and fine.
Questions to ask a psychologist
- Are you accepting new clients, and how soon could I start?
- Which license do you hold, and in which state or province?
- How often do you work with concerns like mine?
- Do you offer psychological testing, or therapy only?
- What do you charge per session, and do you take my insurance or provide a superbill?
- Do you offer online sessions?
- What is your cancellation policy?
- What do you keep confidential, and when would you have to share information?
Terms explained
- PhD / PsyD
- Doctoral degrees in psychology. A PhD usually has a stronger research focus, a PsyD a stronger clinical focus; both can lead to a psychologist license.
- Licensed psychologist
- A person licensed by a state or provincial psychology board to practice psychology. The title is protected by law.
- Psychological associate
- In some states and provinces, a master’s-level practitioner licensed or registered by the psychology board, often with supervision requirements.
- LPC / LMHC / LCPC
- US licenses for professional or mental health counselors (the name differs by state). They provide counseling and therapy.
- LCSW
- Licensed clinical social worker: a master’s-level social worker licensed to provide therapy.
- LMFT
- Licensed marriage and family therapist: licensed to treat individuals, couples and families with a focus on relationships.
- RP / RCC
- Registered psychotherapist (Ontario) and registered clinical counsellor (British Columbia): Canadian titles for licensed therapy providers.
- PSYPACT
- An interstate agreement that lets psychologists licensed in a member state provide telepsychology to clients in other member states once they hold the required authorization.
- Telehealth
- Sessions held by secure video or phone instead of in person. The provider generally needs to be licensed where the client is located.
- CBT
- Cognitive behavioral therapy: a structured talk therapy that works on the links between thoughts, feelings and behavior.
- DBT
- Dialectical behavior therapy: a form of CBT that teaches skills for managing intense emotions and relationships.
- ERP
- Exposure and response prevention: a form of CBT used for OCD.
Psychologists in O'Fallon: frequently asked questions
Who is the best psychologist in O'Fallon?
By RP Score, the highest-ranked psychologist in O'Fallon, MO is Cavins Rick with an RP Score of 71/100. It has 3.5★ from 6 Google reviews. Florian Psychological Services (#2) and Mercy Clinic Child and Adolescent Psychiatry - Technology Drive (#3) follow. We ranked 83 psychologists on eight factors, last updated November 9, 2026.
How many psychologists are there in O'Fallon?
RankedPsychologists ranks 83 psychologists serving O'Fallon, MO. 5 of them are based in O'Fallon; the rest serve it from nearby towns. Another 20 within 20 mi are listed but not ranked yet. Counts are as of November 2026.
What should I do if I need help right now?
In crisis or thinking about suicide? Call or text 988 (US and Canada), any time. In an emergency, call 911. This site cannot help in an emergency.
Which psychologists in O'Fallon work on weekends?
18 of 83 ranked psychologists post Saturday hours and 4 post Sunday hours. The highest-ranked open Saturdays are Marble Wellness (#10), Clarkson Counseling, P.C. (#18) and West County Psychological Associates (#19). Posted hours are office hours; many practices also offer evening or online sessions by appointment.
What Google rating do O'Fallon psychologists have?
The median Google rating among 83 rated psychologists in O'Fallon is 4.4★, with a median of 10 reviews. LifeStance Therapists & Psychiatrists Saint Peters has the most, 469 reviews, and ranks #38. We adjust ratings for review count, so a few five-star reviews cannot top the list.
How does RankedPsychologists rank psychologists?
Each psychologist gets a 0–100 RP Score from eight published factors, led by reputation (25%), specialty focus (25%), proximity (15%) and availability (10%). A practice with no Google reviews scores zero on rating, review volume and recency; other factors we cannot measure are left out. Only practices with a confirmed specialty and 3 or more reviews, or a claimed profile, are ranked.
Do psychologists outside O'Fallon count in this ranking?
Yes, if they are within 20 mi of the O'Fallon city center, our service radius for psychologists. Each listing shows where the practice is based and how far away it is. Proximity is 15% of the RP Score, so a nearby practice gets a small edge.
Can psychologists pay to rank higher on RankedPsychologists?
No. The RP Score never reads payment status, and this ranking has 0 paid placements. Up to 3 Featured practices may appear above the list, labelled Sponsored and showing their honest rank.
How are psychologists in O'Fallon ranked?
Each practice gets an RP Score from 0 to 100 from 8 published factors, including its Google rating, how clearly it focuses on psychology and how close it is. Sponsored placements are shown separately and never change rank. The score does not measure treatment outcomes.
What is the difference between a psychologist and a therapist?
“Psychologist” is a protected title: only people licensed by a state or provincial psychology board may use it. Most hold a doctorate (PhD or PsyD) and are trained in psychological testing as well as therapy. “Therapist” is a general word: licensed counselors, clinical social workers and marriage and family therapists also provide therapy under their own licenses.
Can I see a psychologist online?
Often, yes. Licensing generally follows where you are during the session, so the provider needs to be licensed or authorized there. In the US, psychologists in PSYPACT member states can offer telepsychology to clients in other member states; counselors and social workers have their own rules. In Canada, ask whether the provider is registered in your province.
What if I need help right now?
Do not wait for a consultation. Call or text 988 (US and Canada) if you are in crisis or thinking about suicide, at any time. In an emergency, call 911.
Update log for O'Fallon
- November 2026: RP Scores recalculated for 83 psychologists serving O'Fallon.
More psychologists and O'Fallon pages
Psychologists near O'Fallon
- Psychologists in Dardenne Prairie, MO83 ranked
- Psychologists in Saint Peters, MO111 ranked
- Psychologists in Lake Saint Louis, MO61 ranked
- Psychologists in Wentzville, MO39 ranked
- Psychologists in Saint Charles, MO135 ranked
- Psychologists in Chesterfield, MO138 ranked
- Psychologists in Bridgeton, MO136 ranked
- Psychologists in Wildwood, MO135 ranked
- Psychologists in Maryland Heights, MO138 ranked
- Psychologists in Ballwin, MO138 ranked
Other specialties in O'Fallon
- Therapists and counselors in O'Fallon157 ranked
- Child and teen therapists in O'Fallon49 ranked
- Couples therapists in O'Fallon83 ranked
- Family therapists in O'Fallon83 ranked
- Trauma and PTSD therapists in O'Fallon17 ranked
- Eating disorder therapists in O'Fallon10 ranked
- Psychiatrists in O'Fallon172 ranked
- Clinical social workers in O'Fallon60 ranked
- Addiction counselors in O'Fallon61 ranked
- ABA therapy providers in O'Fallon39 ranked
- All psychologists in O'Fallon