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Gyms in California

How many gyms exist per person present (residents + daytime workers) across the 35 California counties we cover, by ZIP code, compared with the U.S. average. Data: Census ZBP 2023 + ACS 2024 + BLS QCEW.

Includes: Gyms & fitness centers · CrossFit boxes · Boxing, martial arts & dance studios · Recreational sports centers. Counted together because official statistics use one 713940 code.

State verdict (covered counties): In line with the U.S. rate — 103% of the U.S. rate
Counties covered
35
in California
Gyms
4,850
establishments (2023)
Per 10,000 present
1.1
residents + 0.5×workers
U.S. average
1.0
per 10,000 present
State index
103%
vs. U.S.
Residents
38,319,676
in covered counties
Workers
15,030,202
jobs in covered counties
Coverage. This page aggregates only the 35 California counties BizGapMap covers — not the whole state. Counts and the index reflect those counties. The aggregate index uses only ZIP cells Census published, so it is a lower bound. Density is a supply-side signal: it counts existing gyms and the people present, not foot traffic, income, rent, or whether locals want more.

Counties in California

CityCounty GymsResidentsWorkers Per 10kIndexVerdict
San Rafael Marin County 83–133 257,061 106,330 2.7 261–361% Very high density
Santa Rosa Sonoma County 97–157 485,213 174,040 1.7 165–237% High density
Napa Napa County 25–43 135,313 65,776 1.5 145–226% Range spans bands
Santa Cruz Santa Cruz County 46–76 272,278 80,401 1.5 143–206% Range spans bands
El Dorado Hills El Dorado County 32–74 192,693 49,889 1.5 143–295% Range spans bands
Irvine Orange County 563–707 3,175,270 1,572,620 1.4 138–151% Range spans bands
San Francisco San Francisco County 167–199 830,479 727,248 1.4 136–144% Above average
San Diego San Diego County 551–761 3,282,423 1,385,217 1.4 135–159% Range spans bands
Roseville Placer County 69–109 422,233 166,507 1.4 133–210% Range spans bands
Goleta Santa Barbara County 67–121 443,781 158,550 1.3 125–177% Range spans bands
Menlo Park San Mateo County 119–157 713,109 457,352 1.3 123–148% Above average
San Luis Obispo San Luis Obispo County 40–88 271,285 97,546 1.2 122–207% Range spans bands
Redding Shasta County 27–79 190,130 53,985 1.2 121–319% Range spans bands
Ventura Ventura County 122–172 841,297 285,173 1.2 121–141% Above average
West Sacramento Yolo County 32–62 222,458 74,293 1.2 120–218% Range spans bands
Eureka Humboldt County 18–76 134,385 33,944 1.2 116–463% Range spans bands
Concord Contra Costa County 158–214 1,159,422 342,009 1.2 116–145% Above average
Santa Clara Santa Clara County 292–392 1,935,981 1,162,159 1.2 113–126% Above average
Fremont Alameda County 233–281 1,655,008 750,285 1.1 112–126% Above average
Chico Butte County 26–58 207,286 61,889 1.1 106–213% Range spans bands
El Segundo Los Angeles County 1,170–1,656 9,801,306 3,924,098 1.0 97–117% Range spans bands
Fairfield Solano County 48–66 449,663 122,066 0.9 92–122% Range spans bands
Folsom Sacramento County 162–240 1,596,140 531,159 0.9 85–113% Range spans bands
Riverside Riverside County 237–363 2,482,806 674,999 0.8 82–107% Range spans bands
Monterey Monterey County 38–92 426,948 115,284 0.8 76–169% Range spans bands
Ontario San Bernardino County 173–341 2,195,107 711,262 0.7 66–113% Range spans bands
Modesto Stanislaus County 42–82 559,023 148,684 0.7 65–117% Range spans bands
Fresno Fresno County 76–182 1,021,317 301,306 0.6 63–133% Range spans bands
El Centro Imperial County 10–36 174,015 33,702 0.5 51–174% Range spans bands
Hanford Kings County 8–24 152,269 28,375 0.5 47–129% Range spans bands
Bakersfield Kern County 49–147 915,763 218,146 0.5 47–117% Range spans bands
Merced Merced County 13–49 288,279 48,681 0.4 41–146% Range spans bands
Tracy San Joaquin County 37–99 796,477 232,266 0.4 39–91% Range spans bands
Visalia Tulare County 20–82 473,757 104,822 0.4 37–133% Range spans bands
Madera Madera County 0–26 159,701 30,139 0.0 0–134% Range spans bands

Scroll the table sideways to see all columns.

Lowest vs. highest measured density

Fewest competitors per capita

San Rafael
261%
Santa Rosa
165%
Napa
145%
Santa Cruz
143%
El Dorado Hills
143%
Irvine
138%
San Francisco
136%
San Diego
135%

Most competitors per capita

Madera
0%
Visalia
37%
Tracy
39%
Merced
41%
Bakersfield
47%
Hanford
47%
El Centro
51%
Fresno
63%
Low measured density is not evidence of opportunity. A county with few gyms may simply lack foot traffic, retail space, or demand. Use the ranking to find where to look, then verify locally.

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BizGapMap — free, no-login small-business saturation reports for major U.S. counties. Built entirely from public U.S. Census, BLS, and IRS data (ZBP 2023, ACS 2024 5-year, PEP 2024, LODES, QCEW, IRS SOI). No forecasts, no revenue guesses — withheld cells are marked, and the few derived counts are labelled as estimates.