United States · permanent state record · CA
California
California at a glance
- Capital
- Sacramento · I7 on the national map
- U.S. Census Bureau, Guide to 2010 State and Local Census Geography: California · Capital field in the Census state geography guide; source page checked 2026-09-13. This is a federal secondary reference, not the designating constitution or statute.
- Admitted to the Union
- 1850-09-09
- U.S. Senate, California: States in the Senate timeline · Federal institutional history; this is a secondary reference to the act, ratification, or proclamation establishing statehood, not the enrolled act itself.
- Total area
- 163695.6 square miles
- U.S. Census Bureau, State Area Measurements and Internal Point Coordinates · Total area: land and water.
- Population
- 39,355,309 people
- U.S. Census Bureau, Vintage 2025 Population Estimates · Vintage 2025 resident population estimate.
- ZIP Code range
- 900–961
- U.S. Postal Service, ZIP Code system · Summary of ZIP Code prefixes principally assigned to the state; ZIP Codes are routing constructs, not geographic boundaries.
- Area codes
- 209, 213, 279, 310, 323, 341, 350, 357, 369, 408, 415, 424, 442, 510, 530, 559, 562, 619, 626, 628, 650, 657, 661, 669, 707, 714, 738, 747, 760, 805, 818, 820, 831, 837, 840, 858, 909, 916, 925, 949, 951
- North American Numbering Plan Administrator, NPA reports · In-service geographic area codes assigned to the state.
Selected dated milestones · not a complete state history
California through time
Admitted to the Union
California was admitted to the Union on 1850-09-09.
U.S. Senate, California: States in the Senate timeline · as of 2026-09-04