| Business | Phone |
| Prosser City Hall 601 7th St, Prosser 99350 | (509) 786-2332 |
| Prosser Building Dept 601 7th St, Prosser 99350 | (509) 786-7383 |
| Prosser City Waste Water Plant 999 Grand Rd, Prosser 99350 | (509) 786-1101 |
| Prosser Senior Citizens Ctr 1231 Dudley Ave, Prosser 99350 | (509) 786-2915 |