Also see: Historical Resident Population for Spanish & Mexican Period, 1781-1840
| Year | Population of City of Los Angeles | City of Los Angeles Population as Percentage of Los Angeles County | Population of Los Angeles County | Los Angeles County Population as Percentage of California | California Population |
|---|---|---|---|---|---|
| 1850* | 1,610 | 45.6% | 3,530 | 3.8% | 92,597 |
| 1860 | 4,385 | 38.7% | 11,333 | 3.0% | 379,994 |
| 1870 | 5,728 | 37.4% | 15,309 | 2.7% | 560,247 |
| 1880 | 11,183 | 33.5% | 33,381 | 3.9% | 864,694 |
| 1890 | 50,395 | 49.7% | 101,454 | 8.4% | 1,213,398 |
| 1900 | 102,479 | 60.2% | 170,298 | 11.5% | 1,485,053 |
| 1910 | 319,198 | 63.3% | 504,131 | 21.2% | 2,377,549 |
| 1920 | 576,673 | 61.6% | 936,455 | 27.3% | 3,426,861 |
| 1930 | 1,238,048 | 56.1% | 2,208,492 | 38.9% | 5,677,251 |
| 1940 | 1,504,277 | 54.0% | 2,785,643 | 40.3% | 6,907,387 |
| 1950 | 1,970,358 | 47.5% | 4,151,687 | 39.2% | 10,586,223 |
| 1960 | 2,479,015 | 41.0% | 6,039,834 | 38.4% | 15,717,204 |
| 1970 | 2,816,061 | 40.0% | 7,032,075 | 35.2% | 19,971,069 |
| 1980 | 2,950,010 | 39.5% | 7,477,657 | 31.6% | 23,667,764 |
| 1990 | 3,485,398 | 39.3% | 8,863,164 | 29.8% | 29,760,021 |
| 2000 | 3,694,820 | 38.8% | 9,519,338 | 28.1% | 33,871,648 |
| 2010 | 3,792,621 | 38.6% | 9,818,605 | 26.4% | 37,253,956 |
Source: U.S. Census Bureau
* See comment box below.
Also, Historical Populations by Cities in Los Angeles County
The 1850 Census for Los Angeles County was actually conducted in the first two months of 1851, due to California becoming a state only late in 1850. The census-taker for Los Angeles County was just a single individual, John R. Everston, a local who was tasked with covering a county that then encompassed not only present-day Los Angeles County, but also present-day Orange, Ventura and San Bernardino Counties. Considering the size of territory that he had to cover in such a short time, despite it being sparsely population, Everston's count was not considered accurate and is believed to have been a gross under-counted. Indeed, since congressional representation depended on census counts, California conducted its own census in 1852 and counted a bit less than 8,000 residents in Los Angeles County, half of whom were Indian.
