Diamond Bar, California

Diamond Bar population, 2020 to 2024

Diamond Bar lost 2,718 residents from July 2020 to July 2024, a change of -4.9%. In the latest year it moved by -238. Among 429 California places of 5,000 or more, that growth ranks 412th; the median place changed by -1.1%. The median place of 5,000+ in California has 37,056 people, so Diamond Bar is 1.4 times that size.

Diamond Bar covers 14.88 square miles of land, for 3,514 people per square mile of land. The median California place of 5,000+ has 3,725, so Diamond Bar is close to the typical town.

What county Diamond Bar is in

All of Diamond Bar's residents live in Los Angeles County, which had 9,757,179 residents in 2024. Diamond Bar holds 0.5% of the county's population. The shaded shape is on the map above; dots mark the eight nearest places.

ZIP codes in Diamond Bar

2 ZIP Code Tabulation Areas (ZCTAs) overlap Diamond Bar by at least 10% of the ZCTA's or the city's land: 91765, 91789. 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 Diamond Bar is

The Census internal point of Diamond Bar is at 34.001600, -117.817600. Sacramento, the capital, is 376.6 miles NNW in a straight line. The nearest larger place is Pomona, CA (147,966 people), 5.1 miles away.

Daylight in Diamond Bar

At 34.00° N, Diamond Bar gets about 14 h 25 min of daylight around the June solstice and 9 h 53 min around the December solstice, a swing of 4 h 32 min. Figures are sunrise to sunset from the SunCalc model for June 21 and December 21, 2026.

Places near Diamond Bar

The eight nearest incorporated places of 1,000+ in California, measured between internal points. The closest is Walnut, 3.3 miles away, with 27,250 people.