David W. Alexander | |
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| Born | June 22, 1812 Ireland |
| Died | April 29, 1886 (aged 73) Los Angeles, California |
| Occupations | Sheriff |
| Spouse | Adelaida Johnson Mellus |
| Children | 5 |
| Relatives | George C. Alexander (brother) |
David W. Alexander (June 22, 1812 – April 29, 1886) was an early California politician and pioneer in Los Angeles County, California. He was on the Board of Supervisors in 1853 and 1854, and in 1855 he was elected the third sheriff for the county.