| 101 Terra General Engineering | 101 Terra General Engineering | — | (831) 682 5519 | Tree | Seaside · Monterey County | — | — |
| 24 Seven Tree Service | Garduno Jennifer | — | (760) 500 1393 | Tree | Vista · San Diego County | — | — |
| 2C General Engineering | Shannon Dean Criss | — | (530) 230 3861 | Tree | Roseville · Placer County | — | — |
| 360 Tree Service | Jesse Austin Hall | — | (707) 495 2749 | Tree | Santa Rosa · Sonoma County | — | — |
| 4th Generation Tree | Morgan Clay Scovell | — | (805) 462 2020 | Tree | Templeton · San Luis Obispo County | — | — |
| A & A Tree Care | A & A Tree Care | — | (831) 869 9189 | Tree | Seaside · Monterey County | — | — |
| A & A Tree Service INC | Javier Carrillo | — | (310) 559 3628 | Tree | Hacienda Heights · Los Angeles County | — | — |
| A & J Tree | A & J Tree | — | (805) 968 1904 | Tree | Goleta · Santa Barbara County | — | — |
| A & J Tree INC | Jose Guadalupe Jauregui | — | (818) 321 3741 | Tree | Reseda · Los Angeles County | — | — |
| A & M Tree Specialist | Vanesa Acevedo | — | (877) 778 7337 | Tree | Anaheim · Orange County | — | — |
| A & R Tree Services INC | Giovanny Alexander Donado | — | (925) 510 4100 | Tree | Concord · Contra Costa County | — | — |
| A & S Tree Service | Rosas Reyes Antonio De | — | (714) 718 4381 | Tree | Orange · Orange County | — | — |
| A & Y Expert Tree Service INC | Manuel Medardo Arenivar Chavez | — | (408) 624 7790 | Tree | San Jose · Santa Clara County | — | — |
| A + Tree Service | Jason Matthew Clausing | — | (831) 566 4145 | Tree | Felton · Santa Cruz County | — | — |
| A + Tree Service | Jose Luis Pacheco | — | (619) 647 5048 | Tree | Spring Valley · San Diego County | — | — |
| A - 1 Tree Service INC | Donald Edward Needels | — | (408) 448 6408 | Tree | San Jose · Santa Clara County | — | — |
| A - Team Tree Service INC | Adam Richard Rohrbough | — | (530) 306 9613 | Tree | Pollock Pines · El Dorado County | — | — |
| A 1 - Stump Removal | A 1 - Stump Removal | — | (408) 439 6975 | Tree | San Jose · Santa Clara County | — | — |
| A A A Tree Service INC | Antonio Hurtado | — | (510) 538 8761 | Tree | Hayward · Alameda County | — | — |
| A B C Tree Service | Velazquez Erasto | — | (408) 838 7430 | Tree | Gilroy · Santa Clara County | — | — |
| A B Tree Service | Magana Eliel | — | (831) 737 0016 | Tree | Salinas · Monterey County | — | — |
| A Cut Above Tree Service INC | Nicholas Lee Borgatti | — | (530) 643 2155 | Tree | Mt Shasta · Siskiyou County | — | — |
| A M P Tree Service INC | Michael Joseph Pacelli | — | (909) 931 0111 | Tree | Upland · San Bernardino County | — | — |
| A M Tree Service | Adrian Martinez Hernandez | — | (510) 862 9965 | Tree | Hayward · Alameda County | — | — |
| A New Leaf Tree Care | A New Leaf Tree Care | — | (209) 354-0860 | Tree | Merced · Merced County | — | — |
| A S Concrete | A S Concrete | — | (408) 500 9892 | Tree | Morgan Hill · Santa Clara County | — | — |
| A Sandoval Tree Service INC | Alfredo Junior Sandoval | — | (818) 455 3368 | Tree | Arleta · Los Angeles County | — | — |
| A Tall Tree Service INC | Timothy Wayne Rantz | — | (535) 525 1013 | Tree | Tahoma · Placer County | — | — |
| A V R Tree Service | Adelbert Anthony Vonrekowski | — | (707) 994 1849 | Tree | Clearlake · Lake County | — | — |
| A&e Arborists Tree Care | A&e Arborists Tree Care | aearborists@gmail.com | (530) 790-5312 | Tree | Yuba City · Yuba County | — | — |
| A's Tree Service | Segura Areli | — | (714) 296 2598 | Tree | Placentia · Orange County | — | — |
| A's Tree Service INC | Victor Alfonso Gomez Perez | — | (408) 600 8803 | Tree | San Jose · Santa Clara County | — | — |
| A+ramirez Tree Services | Ramirez Morales Javier | — | (559) 704 8081 | Tree | Sanger · Fresno County | — | — |
| A-1 Land Management INC | Ronald Lee Nichols | — | (209) 736 6786 | Tree | Angels Camp · Calaveras County | — | — |
| A-1 Pacific Tree Maintenance | A-1 Pacific Tree Maintenance | — | (661) 755 4949 | Tree | Palmdale · Los Angeles County | — | — |
| A-1 Tree Serv | A-1 Tree Serv | — | (805) 929 2520 | Tree | Nipomo · San Luis Obispo County | — | — |
| A-1 Tree Service | Joseph Eugene Rogers | — | (760) 983 1933 | Tree | Hesperia · San Bernardino County | — | — |
| A. Nichols Tree Service And Excavating | A. Nichols Tree Service And Excavating | — | (707) 272-3362 | Tree | Cobb · Colusa County | — | — |
| A.b.o Tree Service | A.b.o Tree Service | — | (559) 939-7377 | Tree | Fresno · Fresno County | — | — |
| A1ex Tree Service Corp | Jazmin Monserrat Rocha | — | (626) 324 0846 | Tree | Azusa · Los Angeles County | — | — |