Mensa is the world's oldest and largest high-IQ society, welcoming individuals who score in the top 2% of the population on a standardized intelligence test. This comprehensive guide covers the history of Mensa, membership requirements, Lancaster's connection to Mensa, and everything you need to know about testing in Lancaster.

Last Updated: August 2026

The History of Mensa

The Founding: Oxford, England (1946)

Mensa was founded in 1946 at Oxford University in England by two remarkable individuals: Roland Berrill, an Australian barrister, and Dr. Lancelot Ware, a British scientist and lawyer. The two met by chance on a train journey and discovered they shared a common interest in intelligence testing. They decided to form a society for people with high IQs, and the result was Mensa.

The name "Mensa" comes from the Latin word for "table," symbolizing the organization's goal of creating a round-table society where members meet as equals regardless of background, occupation, race, or any other characteristic. The only qualification for membership is intelligence.

The Early Years

Mensa grew slowly at first but steadily gained recognition. By the 1960s, the organization had established chapters in several countries, including the United States. Today, Mensa has grown to over 150,000 members across more than 100 countries, making it the largest and oldest high-IQ society in the world.

American Mensa, the U.S. chapter, now boasts over 50,000 members, representing one of the largest national groups within Mensa International.

Mensa's Three Purposes

Mensa has three stated purposes:

• To identify and foster human intelligence for the benefit of humanity
• To encourage research into intelligence and its characteristics
• To provide a stimulating intellectual and social environment for its members

Lancaster's Connection to Mensa

Lancaster residents are part of the broader Antelope Valley and greater Los Angeles intellectual, educational, and professional community. The city's multilingual population, large public-school system, nearby universities, healthcare sector, aerospace and manufacturing work, and strong small-business culture create many reasons to explore advanced learning and high-ability communities.

Mensa membership is based on an accepted qualifying score, not residence, occupation, education, gender, ethnicity, or language background. No reliable public source provides a city-level Lancaster membership count.

Mensa Qualifying Scores

To qualify for Mensa, you must score at or above the 98th percentile on an approved standardized intelligence test. This means performing better than 98 out of every 100 people who take the same test.

Qualifying Scores by Test

Note that different tests use different standard deviations, which is why the qualifying scores vary. The consistent requirement is the 98th percentile.

Mensa in Lancaster

Mensa Membership in the Lancaster Region

Mensa does not publish a dependable Lancaster membership count. Residents generally connect with the appropriate Greater Los Angeles or Southern California local group and should use the official Mensa directory for current contacts, testing sessions, and events.

Who Takes the Mensa Test in Lancaster?

• Adults seeking formal confirmation that an accepted score falls at or above the 98th percentile.
• Parents exploring youth membership after school or private testing.
• People who already have WAIS, Stanford-Binet, or other accepted historical scores and want to submit prior evidence.
• Multilingual residents who need to confirm whether the admission test or prior-evidence route is most appropriate.

Lancaster and Regional Mensa Events

Local groups may organize meals, games, lectures, youth activities, special-interest gatherings, and regional events. Dates, age rules, guest policies, accessibility, and locations change, so verify them through official Mensa channels.

For private psychological testing, call Morris Clinic, Inc. at (661) 951-4662 and confirm whether the proposed test edition and score report meet current Mensa requirements before scheduling.

Before submitting scores: verify whether Mensa accepts the exact test edition, composite or index score, administration date, age at testing, and examiner credentials. A percentile shown on a school report may not be the qualifying value Mensa requires. Keep original signed documentation and ask whether a sealed or certified copy is needed.

For children, families should consider whether membership activities are age appropriate and socially useful. High scores do not remove the need for emotional support, suitable school challenge, friendships, recreation, and help with any coexisting disability.

Accepted Tests for Mensa Qualification

American Mensa accepts scores from approximately 200 different standardized intelligence tests. Tests must be administered by a neutral and qualified third party in a traditional testing environment.

Tests Commonly Administered by Psychologists

• Wechsler Adult Intelligence Scale (WAIS) – FSIQ 130
• Wechsler Intelligence Scale for Children (WISC) – FSIQ 130
• Stanford-Binet Intelligence Scales – IQ 130-132 (depending on version)
• Reynolds Intellectual Assessment Scales – IQ 130
• Differential Ability Scales (DAS) – GCA 130-132

Tests Administered by Schools

• Cognitive Abilities Test (CogAT) – Composite SAS 132
• Otis-Lennon School Ability Test (OLSAT) – Total SAI 132
• Naglieri Nonverbal Ability Test (NNAT) – Nonverbal Ability Index Score 130-132
• Woodcock-Johnson Test of Cognitive Abilities – IQ 131-132

College Preparatory Tests

• SAT (pre-1994) – Combined Verbal & Math 1250+
• GRE (pre-2001) – Combined Verbal & Quantitative 1250+
• ACT (pre-September 1989) – Composite 29+

The Mensa Testing Process

Two Ways to Qualify

There are two primary pathways to Mensa membership:

1. Take the Mensa Admission Test: A supervised test administered by Mensa proctors
2. Submit prior evidence: If you've already taken an approved test and scored at the 98th percentile, you can submit those scores

The Mensa Admission Test

The Mensa Admission Test is administered in supervised sessions held in cities nationwide, including Lancaster. Key details:

• Duration: 1-2 hours total
• Format: Two separate timed tests (the Wonderlic and Culture Fair tests)
• Qualifying: You only need to qualify on one of the two tests
• Cost: Approximately $40 for the test
• Retake policy: You can retake the test once every eight weeks

What the Mensa Admission Test Measures

• Pattern recognition – Identifying sequences and relationships
• Logical reasoning – Deductive and inductive thinking
• Spatial visualization – Mental manipulation of objects
• Problem-solving – Complex reasoning under time pressure

Important: The Test is for Admission Only

The Mensa Admission Test is specifically designed for admission to Mensa and does not provide a detailed IQ score or report. You will only be notified whether you qualified for membership. If you want a detailed IQ report with index scores, you should take a professionally administered test like WAIS-IV or SB-5 with a licensed psychologist.

Frequently Asked Questions

Lancaster participation note: Because local meetings and supervised testing sessions may be scheduled elsewhere in greater Los Angeles, confirm the venue, parking, travel time, identification rules, age limits, and accepted documentation before leaving the Antelope Valley. A qualifying score can provide access to a social organization, but it does not replace school gifted identification, clinical diagnosis, educational planning, or a complete description of a person's creativity and accomplishments.