San Diego County, California Population 2018
San Diego County, California's estimated population is 3,337,685 with a growth rate of 2.59% in the past year according to the most recent United States census data. San Diego County, California is the 2nd largest county in California.
| Year | Population | Growth | Growth Rate |
| 2017 | 3,337,685 | 84,329 | 2.59% |
| 2016 | 3,253,356 | -63,844 | -1.92% |
| 2016 | 3,317,200 | 27,156 | 0.83% |
| 2015 | 3,290,044 | 33,169 | 1.02% |
| 2014 | 3,256,875 | 40,353 | 1.25% |
| 2013 | 3,216,522 | 36,724 | 1.15% |
| 2012 | 3,179,798 | 40,031 | 1.27% |
| 2011 | 3,139,767 | 35,974 | 1.16% |
| 2010 | 3,103,793 | 605,777 | 24.25% |
| 1990 | 2,498,016 | 636,170 | 34.17% |
| 1980 | 1,861,846 | 503,992 | 37.12% |
| 1970 | 1,357,854 | 324,843 | 31.45% |
| 1960 | 1,033,011 | 476,203 | 85.52% |
| 1950 | 556,808 | 267,460 | 92.44% |
| 1940 | 289,348 | 79,689 | 38.01% |
| 1930 | 209,659 | 97,411 | 86.78% |
| 1920 | 112,248 | 50,583 | 82.03% |
| 1910 | 61,665 | 26,575 | 75.73% |
| 1900 | 35,090 | 103 | 0.29% |
| 1890 | 34,987 | 26,369 | 305.98% |
| 1880 | 8,618 | 3,667 | 74.07% |
| 1870 | 4,951 | 627 | 14.50% |
| 1860 | 4,324 | 3,526 | 441.85% |
| 1850 | 798 | 0.00% |