| City: | Rockford, Illinois |
| County: | Winnebago County |
| Timezone: | Central (GMT -06:00) |
| Local Time: | 8:09:40 AM |
| Population: | No Population Data |
| Area Codes: | 779 / 815 |
| Classification: | PO Box |
| Coordinates: | 42.2712, -89.0939 |
| Quick Link: |
ZIP code 61105 serves a specific downtown location in Rockford, Illinois rather than a residential neighborhood. This PO Box ZIP exists as a point within the larger 61101 ZIP code, covering no geographic territory of its own. The entire ZIP funnels through a single address on South Main Street in the River District.
The 104 PO Boxes here serve a concentrated business community. With 79 business delivery points and only 9 establishments employing 283 workers, this ZIP functions as a commercial mail hub for downtown offices. There's no residential population. All 102 street delivery records point to a single location with unit designators, indicating a multi-tenant office building or commercial complex.
Residents of Rockford don't live in 61105. They receive mail through other Rockford ZIP codes like 61101, which surrounds this point location. This isn't a PO Box Only Zone, so anyone needing a downtown business address can choose between a PO Box here or street delivery through neighboring ZIPs.
The Downtown Rockford and River District neighborhoods sit at this location. Anyone mailing to a 61105 address is reaching a business or PO Box holder at this specific South Main Street facility.
All delivery records point to a single South Main Street address with unit designators, indicating a commercial building.
ZIP Code 61105 supports both business and residential activity. According to the Business Census (2024), there are 8 business establishments, employing about 292 people with an annual payroll of $20,972,000.
| # Residential Mailboxes: | 0Source: USPS |
| # Business Mailboxes: | 0Source: USPS |
| Total Delivery Receptacles: | 204Source: USPS |
| Single Family Delivery Units: | 0Source: USPS |
| Multi Family Delivery Units: | 0Source: USPS |
| # of Businesses: | 8Source: CBP |
| 1st Quarter Payroll: | $4,581,000Source: CBP |
| Annual Payroll: | $20,972,000Source: CBP |
| # of Employees: | 292Source: CBP |
ZIP Code 61105 is located in Winnebago County, Illinois, within the Rockford, IL Metropolitan Statistical Area (CBSA 40420) and Illinois's 17th Congressional District. This Metro area has a population of 349,431 people, about 0.00% of whom live in ZIP Code 61105. It covers 0 sq mi of land and a water area of 0 sq mi.
| CBSA Name: | Rockford, ILSource: Census |
| CBSA Number: | 40420Source: Census |
| CBSA Type: | MetroSource: Census |
| CBSA Division: | --Source: Census |
| CBSA Population: | 349,431Source: Census |
| MSA: | Rockford, IL MSASource: Census |
| Land Area: | --Source: Census |
| Water Area: | --Source: Census |
| Congressional District: | 17Source: USPS |
| Congressional Land Area: | 6933.08 sq miSource: Census |
| PMSA: | --Source: Census |
| Intro Date: | < 2004-10Source: ZIP-Codes.com |
| Place FIPS Code: | 1765000Source: Census |
| Place Name: | Rockford city; IllinoisSource: Census |
We could not locate which school district 61105 belongs to, but we will update this once new district data is released. There are no public schools nor private schools with a mailing address in this ZIP Code. Listing Nearby schools instead. It also has 6 colleges, universities or post secondary education institutions nearby which would be a short commute to.
Our sources include trusted federal and licensed data from the United States Postal Service, U.S. Census Bureau, U.S. Geological Survey, Centers for Medicare & Medicaid Services, and the National Center for Education Statistics, along with proprietary datasets created by ZIP-Codes.com. Data last updated on February 1, 2026.