| Askins (13,170) | Asquez (35,971) | Astillo (15,822) |
| Aston (17,050) | Astro (19,584) | Atchison (28,088) |
| Atchley (17,206) | Ates (11,232) | Atherton (27,961) |
| Athey (10,680) | Atkins (231,515) | Atkinson (212,585) |
| Atson (16,112) | Atterson (10,902) | Atwater (16,093) |
| Atwell (28,711) | Atwood (76,996) | Aubrey (12,601) |
| Auer (21,787) | Auger (10,934) | Aughn (9,862) |
| August (19,045) | Augustin (10,861) | Augustine (39,238) |
| Auld (10,206) | Ault (30,672) | Austin (517,974) |
| Autrey (10,372) | Autry (22,520) | Avalos (59,541) |
| Avant (13,511) | Averill (14,753) | Avery (162,390) |
| Avila (191,779) | Aviles (44,914) | Avina (11,383) |
| Avis (196,219) | Ayala (173,582) | Aycock (16,977) |
| Ayer (25,610) | Ayers (126,172) | Aylor (81,794) |
| Ayres (59,766) | Azevedo (10,559) | Azquez (18,872) |
