How old are the homes in Mason Neck, VA?

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

64.9% (±11.9 points) of the homes in Mason Neck, VA were built before 1980 (2020–2024 American Community Survey).

2.4% were built before 1940.

4.3% were built in 2010 or later.

Figures last updated on November 12, 2026.

Built before 1980: 64.9% (±11.9 points)
Built before 1940: 2.4%
Built 2010 or later: 4.3%

When the homes in Mason Neck were built

Housing units by year structure built, 2020–2024
Year built	Mason Neck	Fairfax County	Virginia	United States
2020 or later	0.0% (±5.3 points)	1.3%	1.7%	2.0%
2010 to 2019	4.3% (±3.1 points)	7.2%	9.9%	9.4%
2000 to 2009	9.8% (±5.0 points)	11.3%	14.9%	13.6%
1990 to 1999	8.7% (±4.9 points)	14.1%	14.3%	12.4%
1980 to 1989	12.2% (±5.2 points)	22.7%	15.8%	12.9%
1970 to 1979	23.9% (±7.0 points)	19.3%	14.3%	14.2%
1960 to 1969	17.5% (±5.5 points)	13.2%	10.0%	9.9%
1950 to 1959	17.6% (±7.0 points)	8.1%	8.0%	9.5%
1940 to 1949	3.5% (±2.9 points)	1.8%	4.2%	4.4%
1939 or earlier	2.4% (±2.2 points)	1.1%	7.0%	11.7%

In Mason Neck, the share of homes built before 1980 is higher than in Fairfax County (43.5%).

It is also higher than in Virginia (43.5%).

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

In Fairfax County, Mason Neck ranks 20 of 69 places with a published estimate, from highest to lowest share of homes built before 1980.

Statewide, it ranks 150 of 464.

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 (41.0%) and the share built before 1980 (64.9%).

Homes built before 1980 in places near Mason Neck

Nearest places with a published estimate, compared with Mason Neck
Place	Distance	Homes built before 1980	Compared with this place
Mason Neck	—	64.9% (±11.9 points)	—
Indian Head	3.7 mi	49.0% (±16.0 points)	Not measurably different
Lorton	4.1 mi	16.0% (±3.6 points)	Lower
Potomac Heights	4.2 mi	97.7% (±17.2 points)	Higher
Fort Belvoir	4.5 mi	24.8% (±7.3 points)	Lower
Woodbridge	4.6 mi	43.5% (±4.4 points)	Lower
Bryans Road	5.3 mi	30.6% (±6.6 points)	Lower
Occoquan	5.4 mi	29.9% (±13.1 points)	Lower
Laurel Hill	5.5 mi	6.4% (±2.7 points)	Lower

Nearby places with a measurably lower figure: Lorton, VA (16.0%), Fort Belvoir, VA (24.8%), Woodbridge, VA (43.5%).

Nearby places with a measurably higher figure: Potomac Heights, MD (97.7%).

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

Homes built before 1980 across Fairfax County, place by place

Rank	Place	Homes built before 1980
14	Mount Vernon	70.1% (±7.6 points)
15	West Falls Church	69.9% (±5.7 points)
16	Long Branch	68.8% (±9.3 points)
17	Pimmit Hills	68.3% (±15.2 points)
18	West Springfield	66.3% (±4.5 points)
19	Vienna	65.3% (±6.0 points)
20 (tie)	Mason Neck	64.9% (±11.9 points)
20 (tie)	Rose Hill	64.9% (±5.7 points)
22	Idylwood	64.1% (±6.2 points)
23	Woodlawn (Fairfax County)	63.8% (±7.1 points)
24	Groveton	59.2% (±7.6 points)
25	Bailey's Crossroads	58.7% (±6.5 points)
26	Hybla Valley	57.9% (±8.5 points)

Showing 13 of 69 places in Fairfax County, ranked from highest to lowest.

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

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 Mason Neck

How old are most homes in Mason Neck?

64.9% of homes in Mason Neck, VA were built before 1980 (2020–2024 American Community Survey).

Do homes in Mason Neck 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 41.0% and 64.9% of homes in Mason Neck were built before then.

Does a contractor need lead certification to work on older homes in Mason Neck?

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 — Mason Neck CDP, Virginia

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 Mason Neck CDP, Virginia (place:49998, in state:51).

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.