What city is 61104 in?

61104 is a Rockford, IL mailing address. By land area, 100% lies inside Rockford.

What is the population of 61104?

About 17,222 people (±1,127), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 17,354.

What is the median household income in 61104?

$33,772 (±$4,398), compared with $83,390 for Illinois as a whole. Half the households in the ZIP code earn more and half earn less.

How many carrier routes and mailboxes are in 61104?

13 USPS carrier routes with 7,123 residential and 779 business mailboxes (7,902 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.

What ZIP codes are near 61104?

The closest, measured center to center: 61108 (4 mi, Rockford), 61109 (4.4 mi, Rockford), 61102 (4.5 mi, Rockford), 61107 (4.6 mi, Rockford), 61112 (5.4 mi, Cherry Valley) and 61114 (5.9 mi, Rockford).

61104 ZIP Code, Rockford, IL

61104 is a ZIP code in Rockford, Illinois in Winnebago County. It covers 4.5 square miles of land. The closest ZIP codes are 61108, 61109 and 61102. 17,222 people live here in 7,672 households. At about 3,827 people per square mile it has suburban density, and most households rent (38% own). Median household income is $33,772, well below the Illinois median of $83,390.

Quick facts

Mailing city: Rockford, IL
County: Winnebago County
Land area: 4.5 sq mi
Population: 17,222
Median household income: $33,772
Carrier routes: 13 (7,123 homes)

Key figures

Measure	Value
Residents	17,222
Households	7,672
Median household income	$33,772
Income per person	$22,510
Median age	34.4
Homeowners	37.8%
Median home value	$90,100
Median rent	$887
Bachelor's degree or higher	9.3%
Average commute (minutes)	23.9
Households with kids under 18	27.5%
Moved in the past year	18.3%
Below the poverty line	37.6%
Broadband internet	77.1%
Speak a non-English language at home	27.5%

Household income

% of households	Value
<$10K	12.2%
$10–15K	8.6%
$15–25K	20.1%
$25–35K	10.6%
$35–50K	14.1%
$50–75K	14.7%
$75–100K	9.1%
$100–150K	5.8%
$150–200K	4.3%
$200K+	0.5%

Age

% of all residents	Value
<10	15.0%
10–19	13.8%
20–24	7.8%
25–34	14.7%
35–44	12.4%
45–54	11.6%
55–64	12.2%
65–74	8.5%
75+	3.9%

Tenure

% of housing units	Value
Owned, with mortgage	13.6%
Owned outright	18.4%
Rented	52.4%
Vacant	15.7%

Type of building

% of housing units	Value
Detached house	39.1%
Townhome	1.7%
2–4 units	44.8%
5–19 units	4.6%
20+ units	9.1%
Mobile / other	0.7%

Businesses in 61104

417 business establishments with 9,357 employees (ZIP Codes Business Patterns 2023).

Other Services (except Public Administration): 69
Manufacturing: 68
Retail Trade: 67
Accommodation and Food Services: 40
Health Care and Social Assistance: 32
Wholesale Trade: 26
Construction: 25
Professional, Scientific, and Technical Services: 18

EDDM carrier routes

61104 has 13 USPS carrier routes with 7,123 residential and 779 business mailboxes. Open the EDDM route map.

Carrier routes in 61104

61104 has 13 USPS carrier routes (13 city (C)) with 7,123 residential and 779 business mailboxes. Routes range from 396 homes (C024) to 704 homes (C016); the median route has 533 homes. The Census counted 7,672 households in 61104 (2020–2024 average); USPS counts current mailboxes, including new and vacant homes.

Homes per route	Routes
1–249	0
250–499	3
500–749	10
750–999	0
1,000–1,499	0
1,500+	0

Best routes in 61104 for…

Most businesses

For B2B offers: office supplies, cleaning, IT, catering and commercial services.

Route C007 — USPS business mailboxes 124, 546 homes
Route C023 — USPS business mailboxes 120, 561 homes
Route C025 — USPS business mailboxes 107, 569 homes
Route C004 — USPS business mailboxes 100, 510 homes
Route C018 — USPS business mailboxes 72, 488 homes

Select these 5 routes on the route map

Every carrier route in 61104

Route	Type	Homes	Businesses	Est. median income	Est. owners	Est. families with kids	Est. moved in past year
C002	City	533	22	$10,642	—	—	—
C003	City	591	40	$27,628	—	—	—
C004	City	510	100	$21,535	—	—	—
C005	City	680	13	$51,719	—	—	—
C007	City	546	124	$40,551	—	—	—
C008	City	528	39	$96,362	—	—	—
C010	City	489	43	$20,584	—	—	—
C013	City	528	53	$37,539	—	—	—
C016	City	704	20	$38,232	—	—	—
C018	City	488	72	$48,864	—	—	—
C023	City	561	120	$34,914	—	—	—
C024	City	396	26	$10,642	—	—	—
C025	City	569	107	$49,809	—	—	—

Income, owners, families and movers are estimates for each route (how we estimate them); mailbox counts are current USPS figures. Open 61104 on the EDDM route map.

How route demographics are estimated

Mailbox counts come from USPS; demographics are estimates

The number of homes and businesses on each carrier route is the current USPS EDDM count. The Census Bureau does not publish figures for carrier routes, so income, homeownership, ages, families, movers and housing age on a route are EDDM2GO estimates built from Census block groups (neighborhood areas of roughly 600 to 3,000 people).

How a route gets its figures: the block-group length-share method

We trace each route's streets every 25 meters and record which block group each stretch falls in. The route's homes are spread along its streets in proportion to length, so a route with 60% of its street length in one block group is assumed to have 60% of its homes there. Each block group then contributes its Census counts in proportion to the share of its housing units that sit on the route (capped at the whole block group). Medians are recalculated from the combined income, home-value and age brackets, the way the Census Bureau computes them, not averaged.

Margins of error

Census survey figures carry a margin of error at 90% confidence; we carry it through the calculation and show it as ±. Our margins treat the route-to-block-group split as exact, so the real uncertainty is larger. Routes with fewer than 100 estimated households, large margins, or streets we could not place are flagged.

Different years

USPS mailbox counts are current. Census figures are 5-year averages for 2020–2024, so a new subdivision may have more homes on the route today than the Census counted. Use the route figures to compare routes with each other, not as an exact head count.

Why some routes show identical figures

Two routes that run through the same block group get the same percentages and medians, because the Census publishes one set of figures for the whole block group. Their mailbox counts still differ, and those are exact.

Route and mailbox counts: USPS EDDM route data. Route demographics: EDDM2GO estimates from U.S. Census Bureau American Community Survey 5-year block-group data (2020–2024) and 2024 cartographic block-group boundaries. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.

Nearby ZIP codes

61108 — Rockford city, IL (4 mi)
61109 — Rockford city, IL (4.4 mi)
61102 — Rockford city, IL (4.5 mi)
61107 — Rockford city, IL (4.6 mi)
61112 — Cherry Valley village, IL (5.4 mi)
61114 — Rockford city, IL (5.9 mi)
61103 — Rockford city, IL (6.2 mi)
61111 — Loves Park city, IL (7 mi)

Areas that include 61104

Rockford, IL ZIP codes — 9 ZIP codes
Winnebago County ZIP codes — 22 ZIP codes
Illinois ZIP code data

Where it ranks

Mail every home in 61104

Route counts on this page price as Full Service 6.5 × 9 postcards: we print, bundle by carrier route and hand the mailing to USPS. Prefer to take it to the Post Office yourself? Print only costs less and you pay postage at drop-off.

EDDM guides

ZIP code statistics describe the Census ZIP Code Tabulation Area (ZCTA) 61104, which approximates the USPS ZIP code area. Census figures: American Community Survey 5-year estimates, 2020–2024.

Frequently asked questions

What city is 61104 in?: 61104 is a Rockford, IL mailing address. By land area, 100% lies inside Rockford.
What county is 61104 in?: 61104 is in Winnebago County.
What is the population of 61104?: About 17,222 people (±1,127), according to the Census Bureau's American Community Survey 5-year estimates for 2020–2024. The 2020 Census counted 17,354.
What is the median household income in 61104?: $33,772 (±$4,398), compared with $83,390 for Illinois as a whole. Half the households in the ZIP code earn more and half earn less.
How many carrier routes and mailboxes are in 61104?: 13 USPS carrier routes with 7,123 residential and 779 business mailboxes (7,902 in all), from the route data stored by EDDM2GO. An EDDM mailing can target any combination of these routes.
What ZIP codes are near 61104?: The closest, measured center to center: 61108 (4 mi, Rockford), 61109 (4.4 mi, Rockford), 61102 (4.5 mi, Rockford), 61107 (4.6 mi, Rockford), 61112 (5.4 mi, Cherry Valley) and 61114 (5.9 mi, Rockford).

This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.