| Business | Phone |
| Montgomery Cnty Dist Ct Clerk 105 E Coolbaugh St, Red Oak 51566 | (712) 623-4986 |
| Montgomery County Treasurer 105 E Coolbaugh St, Red Oak 51566 | (712) 623-3292 |
| Montgomery County Engineer 406 W 4th St, Red Oak 51566 | (712) 623-5197 |
| Montgomery County Env Projects 511 W Coolbaugh, Red Oak 51566 | (712) 623-5197 |
| Montgomery County General Asst 1109 Highland Ave, Red Oak 51566 | (712) 623-3848 |
| Montgomery County Judicial 105 E Coolbaugh St, Red Oak 51566 | (712) 623-9201 |
| Montgomery County Juvenile Ofc 106 W Washington Ave, Red Oak 51566 | (712) 623-4886 |
| Montgomery County Mental Hlth 105 E Coolbaugh St, Red Oak 51566 | (712) 623-6541 |
| Montgomery County Public Hlth 1109 Highland Ave, Red Oak 51566 | (712) 623-4893 |
| Montgomery County Recorder 105 E Coolbaugh St, Red Oak 51566 | (712) 623-4363 |
| Montgomery County Veterans 105 E Coolbaugh St, Red Oak 51566 | (712) 623-3180 |
| Red Oak Sanitarian 1109 Highland Ave, Red Oak 51566 | (712) 623-6543 |