Home age in ZIP 60431, Joliet, IL: median built 1999

Home age is not roof age, and the Census does not record replacements. ZIP 60431 in Joliet, IL: median home built 1999; 51.8% of homes (4,854) are older than 25 years and 15% (1,405) were built since 2010, out of 9,368 homes.

U.S. Census Bureau, American Community Survey 2019 to 2023 (5-year estimates), retrieved October 9, 2026. Area = Census ZIP Code Tabulation Area 60431.

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Share of homes in ZIP 60431 by decade builtColumns from the pre-1940 decade on the left to 2020 and later on the right. pre-1940 0.3 percent; 1940s 0.1 percent; 1950s 1.8 percent; 1960s 4.2 percent; 1970s 12.1 percent; 1980s 7.7 percent; 1990s 25.5 percent; 2000s 33.2 percent; 2010s 13.9 percent; 2020+ 1.1 percentpre-1940: 30 homes, 0.3%0.3%pre-1940Will County: 7.0%1940s: 9 homes, 0.1%0.1%1940sWill County: 2.4%1950s: 173 homes, 1.8%1.8%1950sWill County: 6.4%1960s: 396 homes, 4.2%4.2%1960sWill County: 7.9%1970s: 1,134 homes, 12.1%12.1%1970sWill County: 13.6%1980s: 721 homes, 7.7%7.7%1980sWill County: 9.0%1990s: 2,391 homes, 25.5%25.5%1990sWill County: 22.0%2000s: 3,109 homes, 33.2%33.2%2000sWill County: 25.5%2010s: 1,305 homes, 13.9%13.9%2010sWill County: 5.6%2020+: 100 homes, 1.1%1.1%2020+Will County: 0.7%Built 1999 or earlier: 51.8% of homes (4,854)ZIP 60431, built before 2000built 2000 or laterWill County

Share of the 9,368 housing units in the ZIP, by decade built. The red marks are Will 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 60431 next to Joliet and Will County

IndicatorZIP 60431JolietWill CountyRank among 4 ZIPs of Joliet on this site
Housing units9,36853,636252,6842nd of 4 largest
Median year built1999198619924th of 4 oldest
Built before 198018.6%46.8%37.2%
Built before 200051.8%no data68.2%4th of 4 highest share
Built since 201015%no data6.3%
Owner-occupied homes91.1%73.1%82.5%1st of 4 highest share
Single-family units91.2%79.2%no data
Median home value$275,100 (+/- $9,637)$248,600$298,0001st of 4 highest
Median household income$114,098 (+/- $8,349)$88,026no data1st 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 60431

BuiltShare of Will CountyShare of ZIPHomes in ZIP 60431
2020+0.7%1.1%100
2010s5.6%13.9%1,305
2000s25.5%33.2%3,109
1990s22.0%25.5%2,391
1980s9.0%7.7%721
1970s13.6%12.1%1,134
1960s7.9%4.2%396
1950s6.4%1.8%173
1940s2.4%0.1%9
pre-19407.0%0.3%30

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 60431

ZIP 60431 has 9,368 housing units: 4,854 (51.8%) were built before 2000, 1,405 (15%) in 2010 or later, and 3,109 (33.2%) in the 2000s, its largest era. The median year built is 1999 (Joliet: 1986), so 13 years newer than the city.

Housing mix and money, from the same survey: 91.1% of occupied homes are owner-occupied; 91.2% of units are single-family houses; the median owner-occupied home is valued at $275,100, give or take $9,637; median household income is $114,098, give or take $8,349; the ZIP holds 17.5% of the housing units the Census counts in Joliet, 9,368 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, 2,463 units (26.3%, built before 1990) would be past the 30-year top of the usual asphalt-shingle range, 2,391 (25.5%, the 1990s) would mostly sit past it, 3,109 (33.2%, the 2000s) would mostly be inside the 20 to 30 year window and 1,405 (15%, 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 60431

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 60431 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 60431 among Joliet’s ZIP areas

Map of ZIP 60431 and nearby ZIP areas, shaded by the share of homes built before 2000ZIP 60435: 20,162 homes, 88.6% built before 2000, median year 196360435ZIP 60432: 7,287 homes, 79.6% built before 2000, median year 196460432ZIP 60436: 7,136 homes, 89.1% built before 2000, median year 195960436ZIP 60431: 9,368 homes, 51.8% built before 2000, median year 199960431
  • under 20% built before 2000
  • 40 to 60%
  • 80% or more
  • Dot size = housing units. Red ring = ZIP 60431. Click a dot to open that ZIP.

Closest ZIP areas

ZIPMilesMedian builtPre-2000
604363.7 E195989.1%
604354.2 NE196388.6%
604328.4 E196479.6%

Distance is between Census ZIP centres.

Storm backdrop: Will County

A ZIP is too small for its own hail record, so this is the county. FEMA’s National Risk Index rates Will County Relatively High overall (97.3 of 100), Relatively Low for hail (60.6), Relatively Low for strong wind (50.8) and Very High for tornado (99.2). NOAA logged 111 hail reports in the county, on 32 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 60431: Rockford, IL (70 miles), Kenosha, WI (77 miles), Bloomington, IL (82 miles).

Questions

How old are the homes in ZIP 60431?

Of the 9,368 housing units, 1,742 (18.6%) were built before 1980, 4,854 (51.8%) before 2000 and 1,405 (15%) from 2010 on (Census ACS 2019 to 2023, survey estimate).

Does a house's age tell me how old its roof is in 60431?

No. ACS records the year the structure was built, not the year the roof was last replaced. With 1,742 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, 60436 (3.7 miles E) has the largest share built before 2000, 89.1%, against 51.8% in 60431.

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.