Home age in ZIP 61104, Rockford, IL: median built 1938

Home age is not roof age, and the Census does not record replacements. ZIP 61104 in Rockford, IL: median home built 1938; 95.7% of homes (8,859) are older than 25 years and 2% (186) were built since 2010, out of 9,253 homes.

U.S. Census Bureau, American Community Survey 2019 to 2023 (5-year estimates), retrieved October 9, 2026. Area = Census ZIP Code Tabulation Area 61104.

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Share of homes in ZIP 61104 by decade builtColumns from the pre-1940 decade on the left to 2020 and later on the right. pre-1940 56.3 percent; 1940s 9.7 percent; 1950s 10.9 percent; 1960s 5.8 percent; 1970s 3.2 percent; 1980s 8.6 percent; 1990s 1.3 percent; 2000s 2.2 percent; 2010s 1.8 percent; 2020+ 0.2 percentpre-1940: 5,205 homes, 56.3%56.3%pre-1940Winnebago County: 15.4%1940s: 900 homes, 9.7%9.7%1940sWinnebago County: 6.4%1950s: 1,013 homes, 10.9%10.9%1950sWinnebago County: 14.2%1960s: 534 homes, 5.8%5.8%1960sWinnebago County: 12.8%1970s: 296 homes, 3.2%3.2%1970sWinnebago County: 14.9%1980s: 793 homes, 8.6%8.6%1980sWinnebago County: 10.7%1990s: 118 homes, 1.3%1.3%1990sWinnebago County: 12.3%2000s: 208 homes, 2.2%2.2%2000sWinnebago County: 10.9%2010s: 168 homes, 1.8%1.8%2010sWinnebago County: 2.0%2020+: 18 homes, 0.2%0.2%2020+Winnebago County: 0.2%Built 1999 or earlier: 95.7% of homes (8,859)ZIP 61104, built before 2000built 2000 or laterWinnebago County

Share of the 9,253 housing units in the ZIP, by decade built. The red marks are Winnebago County. This counts houses, not roofs: a roof is replaced several times in the life of a house, and no federal survey records when.

ZIP 61104 next to Rockford and Winnebago County

IndicatorZIP 61104RockfordWinnebago CountyRank among 4 ZIPs of Rockford on this site
Housing units9,25368,027124,9593rd of 4 largest
Median year built1938196219711st of 4 oldest
Built before 198085.9%74.1%63.8%
Built before 200095.7%no data86.8%2nd of 4 highest share
Built since 20102%no data2.3%
Owner-occupied homes37%53.8%65.2%4th of 4 highest share
Single-family units36.6%64.6%no data
Median home value$83,700 (+/- $8,938)$120,900$155,1004th of 4 highest
Median household income$32,161 (+/- $6,019)$53,328no data4th of 4 highest

City figures are for the Census place, county figures for the county; “no data” means the Census file does not publish that figure. Value and income are survey estimates, the plus-or-minus is the 90% margin of error.

Every decade in ZIP 61104

BuiltShare of Winnebago CountyShare of ZIPHomes in ZIP 61104
2020+0.2%0.2%18
2010s2.0%1.8%168
2000s10.9%2.2%208
1990s12.3%1.3%118
1980s10.7%8.6%793
1970s14.9%3.2%296
1960s12.8%5.8%534
1950s14.2%10.9%1,013
1940s6.4%9.7%900
pre-194015.4%56.3%5,205

Counts are Census estimates of housing units by year built (table B25034). If a roof had never been replaced, it would be 3 to 6 years old on a house from the 2020s, 17 to 26 on one from the 2000s, 37 to 46 on one from the 1980s and 87 or more on one from before 1940. Most older houses have had at least one replacement, and the Census does not record when.

What the numbers say about ZIP 61104

ZIP 61104 has 9,253 housing units: 8,859 (95.7%) were built before 2000, 186 (2%) in 2010 or later, and 5,205 (56.3%) before 1940, its largest era. The median year built is 1938 (Rockford: 1962), so 24 years older than the city.

Housing mix and money, from the same survey: 37% of occupied homes are owner-occupied; 36.6% of units are single-family houses; the median owner-occupied home is valued at $83,700, give or take $8,938; median household income is $32,161, give or take $6,019; the ZIP holds 13.6% of the housing units the Census counts in Rockford, 9,253 of them. These are survey estimates with margins of error, and for a small ZIP the margin can be wide.

Reading this for roofs, carefully: the Census records when a house was built, never when its roof was last replaced. If every roof were still the one installed with its house, 8,741 units (94.5%, built before 1990) would be past the 30-year top of the usual asphalt-shingle range, 118 (1.3%, the 1990s) would mostly sit past it, 208 (2.2%, the 2000s) would mostly be inside the 20 to 30 year window and 186 (2%, 2010 onward) would be younger than it. Most older roofs have been replaced, so treat these as the pool of houses where an old roof is possible, not as a count of old roofs.

Roof age calculator for ZIP 61104

Enter the year your house was built, and the year the roof was last replaced if you know it. It starts at the median year built for this ZIP. The share of neighbours’ homes older than yours comes from this ZIP’s own decade counts.

–years old (roof)
–of homes in ZIP 61104 are older
–vs. the ZIP median year built

Material ranges are general planning figures (the same ones as on our roof-age page), not warranties. Sun, storms, attic ventilation and installation quality move them. The decade shares assume homes were built evenly within each decade. This is not an inspection: a roofer on the roof decides.

Map: ZIP 61104 among Rockford’s ZIP areas

Map of ZIP 61104 and nearby ZIP areas, shaded by the share of homes built before 2000ZIP 61107: 13,711 homes, 90.7% built before 2000, median year 196561107ZIP 61108: 12,650 homes, 95.9% built before 2000, median year 196861108ZIP 61114: 6,599 homes, 88.8% built before 2000, median year 198261114ZIP 61104: 9,253 homes, 95.7% built before 2000, median year 193861104
  • under 20% built before 2000
  • 40 to 60%
  • 80% or more
  • Dot size = housing units. Red ring = ZIP 61104. Click a dot to open that ZIP.

Closest ZIP areas

ZIPMilesMedian builtPre-2000
611084.0 E196895.9%
611074.6 NE196590.7%
611145.9 NE198288.8%

Distance is between Census ZIP centres.

Storm backdrop: Winnebago County

A ZIP is too small for its own hail record, so this is the county. FEMA’s National Risk Index rates Winnebago County Relatively Moderate overall (92.4 of 100), Relatively High for hail (97.1), Relatively High for strong wind (97.3) and Relatively High for tornado (97.3). NOAA logged 83 hail reports in the county, on 27 days with hail of 1 inch or more in the full years 2014 to 2025.

FEMA National Risk Index, December 2025 version, county level. This product uses FEMA’s National Risk Index data but is not endorsed by FEMA.

Where to go from here

Other roofing cities near ZIP 61104: Janesville, WI (30 miles), Kenosha, WI (68 miles), Joliet, IL (72 miles).

Questions

How old are the homes in ZIP 61104?

Of the 9,253 housing units, 7,948 (85.9%) were built before 1980, 8,859 (95.7%) before 2000 and 186 (2%) from 2010 on (Census ACS 2019 to 2023, survey estimate).

Does a house's age tell me how old its roof is in 61104?

No. ACS records the year the structure was built, not the year the roof was last replaced. With 7,948 units built before 1980 in this ZIP, many roofs are replacements rather than originals. Ask the seller for permit records or have a roofer inspect the roof.

Which nearby ZIP has the oldest housing?

Of the 3 closest ZIP areas we cover, 61108 (4.0 miles E) has the largest share built before 2000, 95.9%, against 95.7% in 61104.

Source: U.S. Census Bureau, American Community Survey 5-year estimates 2019 to 2023, tables B25034 (year structure built), B25035, B25003, B25024, B25077 and B19013, ZIP Code Tabulation Areas; ZIP-to-city assignment from the Census 2020 ZCTA-to-place relationship file (a ZIP is assigned to a city when more than half of its land area lies inside it). A ZCTA is not a USPS ZIP code: it approximates one and can differ at the edges. Public domain. The 12 ZIP-specific figures above differ from ZIP to ZIP.

Information only, not a roof inspection. Pickaroofer does not know the condition of any individual roof.