PlainZIP

Saint Inigoes, MD · standard

ZIP Code 20684

St. Mary's County, Maryland - Census ACS demographics, housing tenure, and business patterns, benchmarked against every US ZIP.

1,125
48/sq mi
$180,060
Median income
$360,500
Median home value
49.7%
Bachelor's or higher

The verdict

Saint Inigoes pairs a top-decile household income with upper-quartile home values, in a rural, homeowner-dominated area.

Top 2%
household income, US ZIPs
Top 25%
home value, US ZIPs
48
people per sq mi
93%
owner-occupied homes

Source: U.S. Census Bureau ACS 5-Year Estimates (2019–2023). Percentiles rank ZIP 20684 against every reporting US ZIP.

ZIP code 20684 is a sparsely populated ZIP (a standard USPS delivery area) in Saint Inigoes, St. Mary's County, Maryland, home to just 1,125 residents across 23.7 square miles, a density of 48 people per square mile, in the New York time zone.

ZIP 20684 skews affluent, with a median household income of $180,060 (58% above the Maryland average), while per-capita income is $71,244. Local economic indicators show a 1.1% poverty rate alongside 0.0% unemployment. Housing costs here run $360,500 for a typical home value (19% below the state average), with rent averaging - a month; 93.0% of homes are owner-occupied.

A solid share of residents have a four-year degree: 49.7% of adults hold a bachelor's degree or higher, the median age is 44.2, and the average commute is -. Beyond these figures, 10 nearby ZIP codes within about 10 miles are surfaced below, along with 6 more sharing St. Mary's County, letting you compare 20684 to its immediate surroundings rather than a national baseline alone.

Every figure on this page is sourced from the U.S. Census Bureau American Community Survey 5-Year Estimates (including median rent) and the FHFA House Price Index, no estimates, no proprietary scoring. Verify with Census →

Source: U.S. Census Bureau, American Community Survey 5-Year Estimates + ZIP Code Business Patterns + FHFA HPI ACS demographics and median rent, ZBP business establishments, FHFA HPI for ZIP 20684, Saint Inigoes, MD · 2023 Census ACS 5-Year Estimates use a rolling 60-month sample for stable small-geography estimates; ZBP updated annually; FHFA HPI updated quarterly/annually.

Quick Facts

1,125

Population

23.7

Area (sq mi)

48

People / sq mi

New York

Time Zone

standard

ZIP Type

Neighborhood Scorecard
Get an A-F grade across income, safety, housing, rent, education, commute, and childcare for this ZIP code.
View Scorecard →

Who lives in ZIP 20684?

44.2

Median Age

38.0%

Male

62.0%

Female

2.2%

Foreign-Born

White 86.8%
African American 1.1%
Asian 0.0%
American Indian or Alaska Native 0.0%
Native Hawaiian or Pacific Islander 0.0%
Two or More Ethnicities 12.1%
Hispanic or Latino 0.1%

Hispanic or Latino is an ethnicity category from the Census Bureau and may overlap with other categories above.

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

How much do residents earn?

$180,060

Median Household Income

+58% vs state

$71,244

Per Capita Income

1.1%

Poverty Rate

0.0%

Unemployment Rate

How ZIP 20684 ranks nationally

Saint Inigoes, MD household income vs. every US ZIP code

Median household income, the full national distribution, with this ZIP marked

$180,060 Top 2% higher than 98% of 30,318 US ZIPs

$0–$20,000: 118 US ZIPs (0%). Below this entry. $20,000–$40,000: 1,573 US ZIPs (5%). Below this entry. $40,000–$60,000: 7,092 US ZIPs (23%). Below this entry. $60,000–$80,000: 9,980 US ZIPs (33%). Below this entry. $80,000–$100,000: 5,778 US ZIPs (19%). Below this entry. $100,000–$120,000: 2,855 US ZIPs (9%). Below this entry. $120,000–$140,000: 1,362 US ZIPs (4%). Below this entry. $140,000–$160,000: 686 US ZIPs (2%). Below this entry. $160,000–$180,000: 364 US ZIPs (1%). Below this entry. $180,000–$200,000: 186 US ZIPs (1%). This entry sits in this band. $200,000–$220,000: 324 US ZIPs (1%). Above this entry. This ZIP $0 $200K+ every reporting US ZIP, bucketed by value

Each bar is a $20K-wide band; taller bars hold more US ZIPs. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.

Source U.S. Census Bureau, ACS 5-Year Estimates · 2019–2023

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What is the education profile here?

High School Graduate or Higher 90.0%
Bachelor's Degree or Higher 49.7%

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What does housing look like?

357

Total Housing Units

357

Occupied Units

0

Vacant Units

2.24

Avg Household Size

Occupancy Type

Owner 93.0%
Renter 7.0%

$360,500

Median Home Value

-19% vs state

1998

Median Year Built

Source: U.S. Census Bureau, ACS 5-Year Estimates (2023)

What businesses operate in this ZIP?

Census Bureau data shows 20 business establishments in ZIP 20684, employing approximately 551 people with a combined annual payroll of $44,032,000.

20

Businesses

551

Employees

$44.0M

Annual Payroll

1

Industry Sectors

Industry Establishments % of Total
Professional, scientific, and technical services 13 65.0%

Source: U.S. Census Bureau, ZIP Code Business Patterns (ZBP), 2023. Employment figures may include noise for disclosure avoidance.

Nearby ZIP Codes

Want a side-by-side? Compare 20684 vs 20686 →

ZIP 20684 vs its nearest neighbors, by population

Resident population of this ZIP and the closest reporting ZIP codes within ~10 miles.

residents

What this shows Among its immediate neighbors, ZIP 20684 ranks #3 by population - useful context the national average alone can't give.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2019–2023

ZIP 20684 vs its nearest neighbors, by median income

Median household income of this ZIP and the closest reporting ZIP codes within ~10 miles.

median income

What this shows By household income, ZIP 20684 ranks #3 of 6 neighboring ZIPs, local affluence varies block to block, not just metro to metro.

Source U.S. Census Bureau · ACS 5-Year Estimates As of 2019–2023
ZIP Code City Population Distance
20686 Saint Marys City, MD 1,332 2.8 mi
20628 Dameron, MD 594 3.1 mi
20680 Ridge, MD 1,119 2.8 mi
20630 Drayden, MD 348 3.8 mi
20674 Piney Point, MD 830 5.1 mi
20667 Park Hall, MD 494 5.5 mi
20653 Lexington Park, MD 24,481 6.2 mi
20687 Scotland, MD 313 5.6 mi
20692 Valley Lee, MD 1,051 5.8 mi
20690 Tall Timbers, MD 740 6.7 mi

More ZIP Codes in St. Mary's County

20653 standard
Lexington Park, MD
Pop: 24,481
20659 standard
Mechanicsville, MD
Pop: 23,498
20650 standard
Leonardtown, MD
Pop: 13,717
20619 standard
California, MD
Pop: 10,503
20636 standard
Hollywood, MD
Pop: 9,937
20634 standard
Great Mills, MD
Pop: 5,927

Related Areas

St. Mary's County Saint Inigoes, MD Maryland

Frequently Asked Questions

What county is ZIP code 20684 in? ▼
ZIP code 20684 (Saint Inigoes) is located in St. Mary's County, Maryland. St. Mary's County contains multiple ZIP codes, see the full list at /counties/st-marys-md.
What is the population of ZIP code 20684? ▼
ZIP code 20684 in Saint Inigoes, MD has a population of 1,125 according to the Census Bureau ACS 2023 estimates.
What is the median household income in ZIP 20684? ▼
The median household income in ZIP 20684 is $180,060, which is 136% above the national average of $76,288.
What is the average home value in ZIP 20684? ▼
The median home value in ZIP 20684 is $360,500, which is 30% above the national average of $278,155.
What is the demographic makeup of ZIP 20684? ▼
The largest racial group in ZIP 20684 is White at 86.8%. Hispanic or Latino residents make up 0.1% of the population.
How many businesses are in ZIP code 20684? ▼
ZIP code 20684 has 20 business establishments employing approximately 551 people, according to Census Bureau ZIP Code Business Patterns (ZBP) 2023 data.
What is the education level in ZIP code 20684? ▼
In ZIP code 20684, 90.0% of residents aged 25+ have a high school diploma or higher, and 49.7% hold a bachelor's degree or higher. These figures come from the Census Bureau ACS 5-Year Estimates (2023).
What percentage of residents own vs. rent in ZIP 20684? ▼
In ZIP code 20684, approximately 93.0% of occupied housing units are owner-occupied and 7.0% are renter-occupied, based on Census ACS 2023 data.
What is the poverty rate in ZIP code 20684? ▼
The poverty rate in ZIP code 20684 is 1.1% according to Census Bureau ACS 2023 estimates. This measures the percentage of the population living below the federal poverty threshold.

Read our methodology to see how this data is sourced, computed, and verified.