Home age in ZIP 55812, Duluth, MN: median built 1938

Home age is not roof age, and the Census does not record replacements. ZIP 55812 in Duluth, MN: median home built 1938; 90.7% of homes (3,587) are older than 25 years and 7.2% (284) were built since 2010, out of 3,954 homes.

U.S. Census Bureau, American Community Survey 2019 to 2023 (5-year estimates), retrieved October 9, 2026. Area = Census ZIP Code Tabulation Area 55812.

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Share of homes in ZIP 55812 by decade builtColumns from the pre-1940 decade on the left to 2020 and later on the right. pre-1940 67.4 percent; 1940s 4.7 percent; 1950s 6.6 percent; 1960s 3.8 percent; 1970s 3.7 percent; 1980s 2.8 percent; 1990s 1.7 percent; 2000s 2.1 percent; 2010s 7.2 percent; 2020+ 0 percentpre-1940: 2,666 homes, 67.4%67.4%pre-1940St. Louis County: 28.6%1940s: 186 homes, 4.7%4.7%1940sSt. Louis County: 6.0%1950s: 259 homes, 6.6%6.6%1950sSt. Louis County: 13.8%1960s: 151 homes, 3.8%3.8%1960sSt. Louis County: 8.0%1970s: 147 homes, 3.7%3.7%1970sSt. Louis County: 14.3%1980s: 111 homes, 2.8%2.8%1980sSt. Louis County: 7.3%1990s: 67 homes, 1.7%1.7%1990sSt. Louis County: 7.8%2000s: 83 homes, 2.1%2.1%2000sSt. Louis County: 9.1%2010s: 284 homes, 7.2%7.2%2010sSt. Louis County: 4.8%2020+: 0 homes, 0.0%0%2020+St. Louis County: 0.5%Built 1999 or earlier: 90.7% of homes (3,587)ZIP 55812, built before 2000built 2000 or laterSt. Louis County

Share of the 3,954 housing units in the ZIP, by decade built. The red marks are St. Louis 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 55812 next to Duluth and St. Louis County

IndicatorZIP 55812DuluthSt. Louis CountyRank among 6 ZIPs of Duluth on this site
Housing units3,95439,805103,9244th of 6 largest
Median year built1938195119621st of 6 oldest
Built before 198086.2%78.3%70.6%
Built before 200090.7%no data85.6%5th of 6 highest share
Built since 20107.2%no data5.3%
Owner-occupied homes42.2%60.2%72%4th of 6 highest share
Single-family units56.6%63.4%no data
Median home value$301,600 (+/- $24,937)$225,700$208,5002nd of 6 highest
Median household income$66,961 (+/- $7,145)$66,263no data1st of 6 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 55812

BuiltShare of St. Louis CountyShare of ZIPHomes in ZIP 55812
2020+0.5%0.0%0
2010s4.8%7.2%284
2000s9.1%2.1%83
1990s7.8%1.7%67
1980s7.3%2.8%111
1970s14.3%3.7%147
1960s8.0%3.8%151
1950s13.8%6.6%259
1940s6.0%4.7%186
pre-194028.6%67.4%2,666

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 55812

ZIP 55812 has 3,954 housing units: 3,587 (90.7%) were built before 2000, 284 (7.2%) in 2010 or later, and 2,666 (67.4%) before 1940, its largest era. The median year built is 1938 (Duluth: 1951), so 13 years older than the city.

Housing mix and money, from the same survey: 42.2% of occupied homes are owner-occupied; 56.6% of units are single-family houses; the median owner-occupied home is valued at $301,600, give or take $24,937; median household income is $66,961, give or take $7,145; the ZIP holds 9.9% of the housing units the Census counts in Duluth, 3,954 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, 3,520 units (89%, built before 1990) would be past the 30-year top of the usual asphalt-shingle range, 67 (1.7%, the 1990s) would mostly sit past it, 83 (2.1%, the 2000s) would mostly be inside the 20 to 30 year window and 284 (7.2%, 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 55812

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 55812 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 55812 among Duluth’s ZIP areas

Map of ZIP 55812 and nearby ZIP areas, shaded by the share of homes built before 2000ZIP 55805: 5,430 homes, 94.3% built before 2000, median year 193855805ZIP 55806: 4,848 homes, 93.8% built before 2000, median year 193855806ZIP 55807: 4,572 homes, 94.6% built before 2000, median year 193855807ZIP 55808: 2,786 homes, 92.1% built before 2000, median year 194855808ZIP 55802: 1,529 homes, 88.2% built before 2000, median year 195955802ZIP 55812: 3,954 homes, 90.7% built before 2000, median year 193855812
  • under 20% built before 2000
  • 40 to 60%
  • 80% or more
  • Dot size = housing units. Red ring = ZIP 55812. Click a dot to open that ZIP.

Closest ZIP areas

ZIPMilesMedian builtPre-2000
558051.2 SW193894.3%
558023.2 S195988.2%
558063.9 SW193893.8%
558076.8 SW193894.6%
5580812.0 SW194892.1%

Distance is between Census ZIP centres.

Storm backdrop: St. Louis County

A ZIP is too small for its own hail record, so this is the county. FEMA’s National Risk Index rates St. Louis County Relatively Moderate overall (91.6 of 100), Relatively Moderate for hail (84.0), Relatively Moderate for strong wind (71.3) and Relatively Low for tornado (64.7). NOAA logged 239 hail reports in the county, on 45 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 55812: St. Cloud, MN (132 miles), Eau Claire, WI (141 miles), Rochester, MN (193 miles).

Questions

How old are the homes in ZIP 55812?

Of the 3,954 housing units, 3,409 (86.2%) were built before 1980, 3,587 (90.7%) before 2000 and 284 (7.2%) from 2010 on (Census ACS 2019 to 2023, survey estimate).

Does a house's age tell me how old its roof is in 55812?

No. ACS records the year the structure was built, not the year the roof was last replaced. With 3,409 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 5 closest ZIP areas we cover, 55807 (6.8 miles SW) has the largest share built before 2000, 94.6%, against 90.7% in 55812.

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.