Antioch, California

Antioch population, 2020 to 2024

Antioch added 3,071 residents from July 2020 to July 2024, a change of +2.7%. In the latest year it moved by +1,274. Among 429 California places of 5,000 or more, that growth ranks 81st; the median place changed by -1.1%. The median place of 5,000+ in California has 37,056 people, so Antioch is 3.2 times that size.

Antioch covers 29.17 square miles of land and 0.77 of water, for 4,061 people per square mile of land. The median California place of 5,000+ has 3,725, so Antioch is close to the typical town.

What county Antioch is in

All of Antioch's residents live in Contra Costa County, which had 1,172,607 residents in 2024. Antioch holds 10.1% of the county's population. The shaded shape is on the map above; dots mark the eight nearest places.

ZIP codes in Antioch

2 ZIP Code Tabulation Areas (ZCTAs) overlap Antioch by at least 10% of the ZCTA's or the city's land: 94509, 94531. ZCTAs are Census approximations of USPS ZIP code delivery areas. The list comes from the 2020 ZCTA to place relationship file, so a city that annexed land after 2020 may reach into ZIP codes not listed here.

Where Antioch is

The Census internal point of Antioch is at 37.978300, -121.796100. Sacramento, the capital, is 44.5 miles NNE in a straight line. The nearest larger place is Concord, CA (124,016 people), 11.2 miles away. The ground at the internal point is about 70 m (230 ft) above sea level.

Daylight in Antioch

At 37.98° N, Antioch gets about 14 h 48 min of daylight around the June solstice and 9 h 32 min around the December solstice, a swing of 5 h 17 min. Figures are sunrise to sunset from the SunCalc model for June 21 and December 21, 2026. Month-by-month sunrise and sunset times are on the Antioch daylight page.

Places near Antioch

The eight nearest incorporated places of 1,000+ in California, measured between internal points. The closest is Brentwood, 5.1 miles away, with 66,286 people.