How old are the homes in Lake Hopatcong, NJ?

Name: Age of homes in Lake Hopatcong, NJ, 2020–2024
Creator: US Census Bureau
License: https://www.census.gov/data/developers/about/terms-of-service.html

72.4% (±11.2 points) of the homes in Lake Hopatcong, NJ were built before 1980 (2020–2024 American Community Survey).

11.1% were built before 1940.

1.0% were built in 2010 or later.

Figures last updated on November 12, 2026.

Built before 1980: 72.4% (±11.2 points)
Built before 1940: 11.1%
Built 2010 or later: 1.0%

When the homes in Lake Hopatcong were built

Housing units by year structure built, 2020–2024
Year built	Lake Hopatcong	Morris County	New Jersey	United States
2020 or later	0.3% (±0.5 points)	0.9%	1.1%	2.0%
2010 to 2019	0.7% (±0.9 points)	5.2%	6.2%	9.4%
2000 to 2009	10.4% (±2.7 points)	7.5%	9.2%	13.6%
1990 to 1999	7.8% (±3.4 points)	11.3%	8.9%	12.4%
1980 to 1989	8.5% (±3.6 points)	12.6%	11.8%	12.9%
1970 to 1979	8.3% (±3.0 points)	13.5%	12.3%	14.2%
1960 to 1969	19.3% (±4.8 points)	16.0%	12.8%	9.9%
1950 to 1959	22.1% (±5.3 points)	14.7%	13.8%	9.5%
1940 to 1949	11.6% (±4.3 points)	5.8%	6.5%	4.4%
1939 or earlier	11.1% (±6.8 points)	12.4%	17.4%	11.7%

In Lake Hopatcong, the share of homes built before 1980 is not measurably different from Morris County (62.4%).

It is not measurably different from New Jersey (62.8%).

It is higher than the national figure (49.7%).

In Morris County, Lake Hopatcong ranks 12 of 27 places with a published estimate, from highest to lowest share of homes built before 1980.

Statewide, it ranks 84 of 252.

Rankings use the estimates alone; where margins of error overlap, neighboring ranks may not truly differ.

Why the age of a home matters: lead-based paint

Federal law treats housing built before 1978 as likely to contain lead-based paint.

Before a lease or sale of most pre-1978 housing, the landlord or seller must disclose any known lead-based paint and hazards and give the tenant or buyer the EPA pamphlet (42 U.S.C. § 4852d; 40 CFR part 745, subpart F; 24 CFR part 35, subpart A).

A contractor paid to renovate, repair or paint a pre-1978 home must be a certified firm, use a certified renovator and follow lead-safe work practices under the Renovation, Repair and Painting Rule (40 CFR part 745, subpart E) whenever the job disturbs more than 6 square feet of painted surface in a room or more than 20 square feet outside; window replacement and demolition always count (40 CFR 745.83).

Certification comes from EPA, or from the state where EPA has authorized the state to run the program.

The Census Bureau groups construction by decade, so the share built before 1978 lies between the share built before 1970 (64.1%) and the share built before 1980 (72.4%).

Homes built before 1980 in places near Lake Hopatcong

Nearest places with a published estimate, compared with Lake Hopatcong
Place	Distance	Homes built before 1980	Compared with this place
Lake Hopatcong	—	72.4% (±11.2 points)	—
Hopatcong Borough	2.8 mi	83.0% (±7.4 points)	Not measurably different
Mount Arlington Borough	3.1 mi	44.4% (±8.6 points)	Lower
Mount Hope	4.2 mi	37.2% (±10.3 points)	Lower
Landing	4.6 mi	75.9% (±14.2 points)	Not measurably different
Wharton Borough	4.7 mi	72.1% (±17.0 points)	Not measurably different
Lake Mohawk	4.9 mi	72.3% (±9.6 points)	Not measurably different
Roxbury Township	5.4 mi	64.7% (±5.5 points)	Not measurably different
Byram Township	5.4 mi	77.0% (±8.2 points)	Not measurably different

Nearby places with a measurably lower figure: Mount Arlington Borough, NJ (44.4%), Mount Hope, NJ (37.2%).

Distance is measured in a straight line between the Census Bureau’s internal points for each place.

Homes built before 1980 across Morris County, place by place

Rank	Place	Homes built before 1980
6 (tie)	Brookside	75.9% (±24.1 points)
6 (tie)	Landing	75.9% (±14.2 points)
8	White Meadow Lake	75.8% (±8.8 points)
9	Parsippany	75.3% (±6.0 points)
10	Lake Telemark	75.1% (±23.4 points)
11	Gillette	73.6% (±21.7 points)
12	Lake Hopatcong	72.4% (±11.2 points)
13	Succasunna	71.8% (±7.9 points)
14	Budd Lake	63.0% (±9.7 points)
15	Pine Brook	62.9% (±15.4 points)
16	Towaco	60.7% (±17.9 points)
17	Millington	60.5% (±13.2 points)
18	Green Village	59.5% (±23.0 points)

Showing 13 of 27 places in Morris County, ranked from highest to lowest.

Lake Hopatcong is a census-designated place: an unincorporated community the Census Bureau draws for statistics, with no municipal government of its own.

It lies inside Jefferson Township, whose figures include it.

Survey years: 2020–2024 (American Community Survey 5-year estimates).

Margins of error are at the 90% confidence level.

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Questions about Lake Hopatcong

How old are most homes in Lake Hopatcong?

72.4% of homes in Lake Hopatcong, NJ were built before 1980 (2020–2024 American Community Survey).

Do homes in Lake Hopatcong need a lead paint disclosure?

A home built before 1978 does, before it is rented or sold, unless an exemption applies (42 U.S.C. § 4852d); between 64.1% and 72.4% of homes in Lake Hopatcong were built before then.

Does a contractor need lead certification to work on older homes in Lake Hopatcong?

Yes, when the job disturbs more than 6 square feet of paint in a room or 20 square feet outside, or replaces a window: the firm must be certified and a certified renovator must direct the work under the Renovation, Repair and Painting Rule (40 CFR part 745, subpart E).

Sources

Selected Housing Characteristics (DP04), 2020–2024 ACS 5-year estimates — Lake Hopatcong CDP, New Jersey

To check these figures in the Census Bureau’s own API, request the variables below from the 2024 ACS 5-year data profile (acs/acs5/profile) for Lake Hopatcong CDP, New Jersey (place:37710, in state:34).

Each estimate (E or PE) has a margin of error beside it (M or PM).

The API needs a free key.

Request a Census API key.

DP04_0017PE, DP04_0017PM, DP04_0018PE, DP04_0018PM, DP04_0019PE, DP04_0019PM, DP04_0020PE, DP04_0020PM, DP04_0021PE, DP04_0021PM, DP04_0022PE, DP04_0022PM, DP04_0023PE, DP04_0023PM, DP04_0024PE, DP04_0024PM, DP04_0025PE, DP04_0025PM, DP04_0026PE, DP04_0026PM

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

Figures are published by the US Census Bureau, HUD, the Bureau of Labor Statistics and the FBI; Seayora reproduces them and does not adjust them, except where a sentence says it compares dollar figures after inflation. They describe the whole place, not any one building or street, and are not an appraisal, a rent determination, a tax bill, a safety rating or legal advice.