| 1st Stop Fencing | 1st Stop Fencing | — | (916) 337 1590 | Other | Shingle Springs · El Dorado County | — | — |
| 3D Tile | 3D Tile | — | (209) 304 7034 | Other | Cool · El Dorado County | — | — |
| 3M Utilities | 3M Utilities | — | (650) 235 0525 | Other | El Dorado · El Dorado County | — | — |
| 4291 Tree Services LLC | Evan William Jones | impallari@gmail.com | (844) 772 4291 | Other | Placerville · El Dorado County | — | — |
| A C T C Young INC | Joshua Eugene Young | — | (916) 765 1308 | Other | Placerville · El Dorado County | — | — |
| A P Backhoe & Trucking Service INC | Antonio Teixeira Poipao | — | (925) 864 4344 | Other | Placerville · El Dorado County | — | — |
| A1 Affordable Plumbing & Water Heaters | Shtulvarg Zeev | — | (916) 488 7283 | Other | El Dorado Hills · El Dorado County | — | — |
| Access Systems INC | Michael Dwayne Herd | customerservice@accesssystems.com | (916) 941 8099 | Other | El Dorado Hills · El Dorado County | — | — |
| Accurate Audio Video | Darrell Eugene Schue | aavslt@gmail.com | (530) 541 1696 | Other | South Lake Tahoe · El Dorado County | — | — |
| Accurate Iron | Accurate Iron | — | (530) 558 1354 | Other | Placerville · El Dorado County | — | — |
| Action Rooter | Action Rooter | — | (530) 251 3496 | Other | Diamond Springs · El Dorado County | — | — |
| Adrenaline Construction | Kyle Davis Holmes | — | (530) 329 4939 | Other | Shingle Springs · El Dorado County | — | — |
| Afs Sprinkler INC | Mooni Nandan Sanwal | — | (916) 936 9405 | Other | El Dorado Hills · El Dorado County | — | — |
| Ajay Meixner Construction | Ajay Wyatt Meixner | — | (530) 919 2561 | Other | Lotus · El Dorado County | — | — |
| Al's Plumbing Company INC | Alvaro Rivera | — | (530) 448 3233 | Other | Pollock Pines · El Dorado County | — | — |
| All Design Fencing And C M Blacksmithing | Charles Merrell Lyman | — | (530) 622 2465 | Other | Diamond Springs · El Dorado County | — | — |
| All Points Welding | All Points Welding | — | (530) 295 9380 | Other | Diamond Springs · El Dorado County | — | — |
| All Star Seamless Rain Gutters | All Star Seamless Rain Gutters | allstarseamless@gmail.com | (916) 969 6975 | Other | El Dorado Hills · El Dorado County | — | — |
| Almendariz Consulting INC | Kirk Lee Ridgley | info@almendarizconsulting.com | (916) 939 3392 | Other | El Dorado Hills · El Dorado County | — | — |
| Alpenglow Tree Service | Travis David Junkin | alpenglowtreeservice@gmail.com | (713) 299 3287 | Other | South Lake Tahoe · El Dorado County | — | — |
| Alpine - Smith INC | Lisette Maria Smith | info@alpinesmith.com | (530) 541 0250 | Other | South Lake Tahoe · El Dorado County | — | — |
| Alpine Earthworks General Engineering INC | Cameron M Hornish | — | (530) 318 8577 | Other | South Lake Tahoe · El Dorado County | — | — |
| Alpine Metals | Alpine Metals | — | (530) 541 4180 | Other | South Lake Tahoe · El Dorado County | — | — |
| Alternative Structural Technologies INC | Glenn Paul Evans | — | (530) 676 6550 | Other | Shingle Springs · El Dorado County | — | — |
| Altitude Hardwood Flooring | Altitude Hardwood Flooring | — | (818) 472 5672 | Other | South Lake Tahoe · El Dorado County | — | — |
| Ameri Turf Hydroseed | Ameri Turf Hydroseed | — | (530) 957 7801 | Other | Placerville · El Dorado County | — | — |
| American River Fence | American River Fence | — | (916) 995 2556 | Other | Lotus · El Dorado County | — | — |
| American Windmill | American Windmill | — | (530) 644 3008 | Other | Diamond Springs · El Dorado County | — | — |
| Apex Plumbing | Ghassan Hikmat Zeidan | — | (925) 240 3011 | Other | Camino · El Dorado County | — | — |
| Apollo Screen And Shade | Craig James Roberts | — | (916) 542 2900 | Other | El Dorado Hills · El Dorado County | — | — |
| Aquilina Hardwood Floors | Aquilina Hardwood Floors | — | (530) 318 7404 | Other | South Lake Tahoe · El Dorado County | — | — |
| Arbor Vitae Enterprises INC | Luis Ignacio Cruz Moran | — | (661) 330 8255 | Other | Cameron Park · El Dorado County | — | — |
| Arc Empire INC DBA Rutter Fencing And Gates | Conley Jack Rutter | — | (530) 718 0051 | Other | Greenwood · El Dorado County | — | — |
| Ardor Consulting Corporation | Larry Misutyo Ito | — | (530) 672 0638 | Other | El Dorado Hills · El Dorado County | — | — |
| Arjil Tile Works INC | Anthony Joseph Iii Arjil | — | (530) 305 6531 | Other | El Dorado Hills · El Dorado County | — | — |
| Arrow Fence | Armando Lepe Ramirez | — | (916) 586 0475 | Other | Shingle Springs · El Dorado County | — | — |
| Arthur Chesser Drywall | Arthur Chesser Drywall | — | (530) 906 1093 | Other | Somerset · El Dorado County | — | — |
| Artigiano Tile And Stone | Artigiano Tile And Stone | — | (530) 957 6488 | Other | Diamond Springs · El Dorado County | — | — |
| Ascendant Tree LLC | Kyle Alexander Connally | — | (530) 966 3337 | Other | Lotus · El Dorado County | — | — |
| Atlas Concrete Concepts | Atlas Concrete Concepts | — | (530) 933 2701 | Other | El Dorado · El Dorado County | — | — |