| I P F Electric | Jesus Santiago Sandoval | — | (925) 393 2873 | Electricians | Stockton · San Joaquin County | — | — |
| I Systems Security | I Systems Security | info@isystemssecurity.com | (209) 298 8018 | Electricians | Stockton · San Joaquin County | — | — |
| I X Electric INC | Villa Ruben Salgado | — | (510) 921 0114 | Electricians | Tracy · San Joaquin County | — | — |
| I5 Electric | Dan Hung Nguyen | sales@i5electric.com | (209) 405 1238 | Electricians | Stockton · San Joaquin County | — | — |
| I:s Contractors LLC | Ignacio Sandoval Uribe | — | (209) 639 2199 | HVAC | Stockton · San Joaquin County | — | — |
| Ians Carports LLC | Jose Luis Aguilar Armas | — | (209) 910 2716 | Other | Stockton · San Joaquin County | — | — |
| Icad INC | Travis Adam Brown | — | (209) 426 5923 | Other | Lodi · San Joaquin County | — | — |
| Icad Solutions INC | Travis Adam Brown | — | (209) 518 9921 | Other | Lodi · San Joaquin County | — | — |
| Ice Man Mike Commercial Ice Machine Repair | Maurice Michael Wyatt | — | (916) 335 3883 | HVAC | Stockton · San Joaquin County | — | — |
| Iconic Electric | Flores Yonic | engr.alimuneer@gmail.com | (209) 663 8598 | Electricians | Lodi · San Joaquin County | — | — |
| Iconic Tile Designs INC | Nicholas Jeremy Dennert | — | (209) 712 4205 | Other | Lodi · San Joaquin County | — | — |
| Icr Refrigeration INC | Jeremy Don Mustin | — | (209) 333 1943 | HVAC | Lodi · San Joaquin County | — | — |
| Ideal Tile Company INC | Sean Joseph Ziller | — | (209) 321 7768 | Other | Tracy · San Joaquin County | — | — |
| Iglesias Painting | Iglesias Painting | — | (209) 629 8497 | Windows, patio, painters | Manteca · San Joaquin County | — | — |
| Iherson's Construction And Renovation INC | Ortigoza Iherson Lopez | — | (831) 905 4273 | GC, remodel, ADU | Tracy · San Joaquin County | — | — |
| Iii Generation Fence | Iii Generation Fence | — | (415) 589 0999 | Other | Tracy · San Joaquin County | — | — |
| Image Tile & Stone Inc. | Jason David Rose | — | (209) 834 6861 | Other | Mountain House · San Joaquin County | — | — |
| Imagine Design And Landscape | Imagine Design And Landscape | — | (209) 663 0100 | Windows, patio, painters | Lodi · San Joaquin County | — | — |
| Imperial Pools Service Maintenance INC | David Velazquez | — | (209) 981 7314 | Pool | Stockton · San Joaquin County | — | — |
| Independent Construction Company | Arthur Thomas Jewell | brian@independent-construction.com | (209) 639 8000 | HVAC | Stockton · San Joaquin County | — | — |
| Industrial Ag Solutions LLC DBA Ias Electric | Bryan Allan Watson-Galluzi | — | (209) 609 9130 | Electricians | Linden · San Joaquin County | — | — |
| Infinity Glass & Glazing INC | Michael Anthony Wheeler | — | (209) 888 6370 | Windows, patio, painters | Stockton · San Joaquin County | — | — |
| Infinity Security Solutions | Jonathan Spencer Grigsby | — | (209) 670 6157 | Alarm and generators | Woodbridge · San Joaquin County | — | — |
| Infinity Shutters & Blinds | Infinity Shutters & Blinds | — | (925) 321 0721 | Other | Manteca · San Joaquin County | — | — |
| Ini Interior Improvements | Ini Interior Improvements | — | (209) 872 7065 | GC, remodel, ADU | Escalon · San Joaquin County | — | — |
| Iniguez Millwork And Cabinetry | Iniguez Millwork And Cabinetry | — | (209) 981 4614 | Other | Stockton · San Joaquin County | — | — |
| Inncal Incorporated | Carl William Jr Thompson | — | (209) 951 9448 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Innovated Construction & Consulting INC | Edward Flores Rodriguez | — | (209) 992 1284 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Innovating Electric | Eduardo Alejandro Lira-Cruz | %20request@innovatingelectric.com | (209) 453 6127 | Electricians | Stockton · San Joaquin County | — | — |
| Innovation Custom Painting | Innovation Custom Painting | innovationcp01@gmail.com | (209) 641 1435 | Windows, patio, painters | Stockton · San Joaquin County | — | — |
| Innovation Roofing INC | Henrry Jesus Ramirez | — | (510) 203 0948 | Other roofers | Tracy · San Joaquin County | — | — |
| Innovative Fence And Iron Works | Innovative Fence And Iron Works | — | (209) 751 7503 | Other | Stockton · San Joaquin County | — | — |
| Innovative Flooring INC | Aguilar George Barajas | — | (510) 314 9699 | Other | Tracy · San Joaquin County | — | — |
| Innovative Roofing | Soto De La Rosa Ramon | — | (888) 677 9234 | Other roofers | Lodi · San Joaquin County | — | — |
| Innovative Roofing INC | De La Rosa Ramon Soto | innovativeroofing@icloud.com | (888) 677 9234 | Other roofers | Lodi · San Joaquin County | — | — |
| Integrated Power Systems INC | Joel Jr Chavez | — | (209) 518 5210 | Electricians | Stockton · San Joaquin County | — | — |
| Integrated Telecom Solutions | Chad Vincent Bosworth | — | (209) 329 3118 | Other | Lodi · San Joaquin County | — | — |
| Integrity Builders Group INC | David Leslie Bafford | — | (510) 499 9776 | GC, remodel, ADU | Tracy · San Joaquin County | — | — |
| Integrity Construction | Dorgan Terrance | — | (209) 483 6252 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Integrity Plus Plumbing | Integrity Plus Plumbing | — | (510) 978 6955 | Other | Stockton · San Joaquin County | — | — |