Home age in ZIP 37604, Johnson City, TN: median built 1980

Home age is not roof age, and the Census does not record replacements. ZIP 37604 in Johnson City, TN: median home built 1980; 78.6% of homes (15,198) are older than 25 years and 10.8% (2,096) were built since 2010, out of 19,334 homes.

U.S. Census Bureau, American Community Survey 2019 to 2023 (5-year estimates), retrieved October 9, 2026. Area = Census ZIP Code Tabulation Area 37604.

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Share of homes in ZIP 37604 by decade builtColumns from the pre-1940 decade on the left to 2020 and later on the right. pre-1940 9.4 percent; 1940s 5 percent; 1950s 9.8 percent; 1960s 10 percent; 1970s 16.1 percent; 1980s 11.8 percent; 1990s 16.5 percent; 2000s 10.6 percent; 2010s 9.7 percent; 2020+ 1.1 percentpre-1940: 1,816 homes, 9.4%9.4%pre-1940Washington County: 7.4%1940s: 972 homes, 5.0%5%1940sWashington County: 4.2%1950s: 1,886 homes, 9.8%9.8%1950sWashington County: 8.0%1960s: 1,928 homes, 10.0%10%1960sWashington County: 9.0%1970s: 3,113 homes, 16.1%16.1%1970sWashington County: 14.3%1980s: 2,289 homes, 11.8%11.8%1980sWashington County: 12.0%1990s: 3,194 homes, 16.5%16.5%1990sWashington County: 16.8%2000s: 2,040 homes, 10.6%10.6%2000sWashington County: 16.9%2010s: 1,881 homes, 9.7%9.7%2010sWashington County: 9.9%2020+: 215 homes, 1.1%1.1%2020+Washington County: 1.5%Built 1999 or earlier: 78.6% of homes (15,198)ZIP 37604, built before 2000built 2000 or laterWashington County

Share of the 19,334 housing units in the ZIP, by decade built. The red marks are Washington 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 37604 next to Johnson City and Washington County

IndicatorZIP 37604Johnson CityWashington CountyRank among 1 ZIPs of Johnson City on this site
Housing units19,33433,08661,426
Median year built198019831986
Built before 198050.2%46.4%42.8%
Built before 200078.6%no data71.7%
Built since 201010.8%no data11.4%
Owner-occupied homes48.8%49.8%64.4%
Single-family units58.3%57.6%no data
Median home value$231,900 (+/- $14,313)$238,000$231,700
Median household income$49,351 (+/- $6,416)$55,429no data

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 37604

BuiltShare of Washington CountyShare of ZIPHomes in ZIP 37604
2020+1.5%1.1%215
2010s9.9%9.7%1,881
2000s16.9%10.6%2,040
1990s16.8%16.5%3,194
1980s12.0%11.8%2,289
1970s14.3%16.1%3,113
1960s9.0%10.0%1,928
1950s8.0%9.8%1,886
1940s4.2%5.0%972
pre-19407.4%9.4%1,816

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 37604

ZIP 37604 has 19,334 housing units: 15,198 (78.6%) were built before 2000, 2,096 (10.8%) in 2010 or later, and 3,194 (16.5%) in the 1990s, its largest era. The median year built is 1980 (Johnson City: 1983), so 3 years older than the city.

Housing mix and money, from the same survey: 48.8% of occupied homes are owner-occupied; 58.3% of units are single-family houses; the median owner-occupied home is valued at $231,900, give or take $14,313; median household income is $49,351, give or take $6,416; the ZIP holds 58.4% of the housing units the Census counts in Johnson City, 19,334 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, 12,004 units (62.1%, built before 1990) would be past the 30-year top of the usual asphalt-shingle range, 3,194 (16.5%, the 1990s) would mostly sit past it, 2,040 (10.6%, the 2000s) would mostly be inside the 20 to 30 year window and 2,096 (10.8%, 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 37604

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 37604 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 37604 among Johnson City’s ZIP areas

Map of ZIP 37604 and nearby ZIP areas, shaded by the share of homes built before 2000ZIP 37604: 19,334 homes, 78.6% built before 2000, median year 198037604
  • under 20% built before 2000
  • 40 to 60%
  • 80% or more
  • Dot size = housing units. Red ring = ZIP 37604. Click a dot to open that ZIP.

Storm backdrop: Washington County

A ZIP is too small for its own hail record, so this is the county. FEMA’s National Risk Index rates Washington County Relatively Low overall (61.2 of 100), Relatively Low for hail (38.0), Relatively High for strong wind (87.5) and Relatively Low for tornado (50.1). NOAA logged 17 hail reports in the county, on 10 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 37604: Kingsport, TN (20 miles), Asheville, NC (51 miles), Knoxville, TN (89 miles).

Questions

How old are the homes in ZIP 37604?

Of the 19,334 housing units, 9,715 (50.2%) were built before 1980, 15,198 (78.6%) before 2000 and 2,096 (10.8%) from 2010 on (Census ACS 2019 to 2023, survey estimate).

Does a house's age tell me how old its roof is in 37604?

No. ACS records the year the structure was built, not the year the roof was last replaced. With 9,715 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.

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.