21660 ZIP Code — Ridgely, MD
Caroline County, Maryland
ZIP code 21660 is located in Ridgely, Maryland, within Caroline County. It covers approximately 32.66 square miles and serves a population of 4,100 residents. This is a standard ZIP code in the Eastern (ET) timezone, served by area code 410/667.
About ZIP code 21660
The housing stock consists of predominantly single-family detached homes. Most homes were built in the 1980s, giving the area an established character. Median home value is $292,300. Owner-occupancy sits near the national average at 70%.
Median household income is $78,922. The poverty rate of 6% is below the national average.
The dominant occupation class is management, business, and professional, with education and healthcare as the leading industry. An above-average commute of 38 minutes suggests many residents work outside the immediate area.
College attainment at 18% is below the national average, consistent with a trades and production-oriented local economy.
4,100
population
32.66
sq mi land
Standard
ZIP type
Eastern (ET)
timezone
21660 ZIP code map
Cities in ZIP code 21660
Below are the cities the US Postal Service accepts for ZIP code 21660. Using any city not on this list may result in mail delivery delays.
| City | Status |
|---|---|
| Ridgely | Preferred |
Nearby ZIP codes
21639 Greensboro (4.7 mi)
21657 Queen Anne (5.2 mi)
21636 Goldsboro (5.9 mi)
21640 Henderson (8.3 mi)
21629 Denton (8.6 mi)
21625 Cordova (8.7 mi)
21617 Centreville (9.7 mi)
21644 Ingleside (10.7 mi)
21679 Wye Mills (11.2 mi)
21607 Barclay (11.9 mi)
21623 Church Hill (12.2 mi)
21649 Marydel (13.3 mi)
Demographics
updated 05/2026
| Population | |
|---|---|
| Total population | 4,100 |
| Population density | 126 / sq mi |
| State FIPS | 24 |
| County FIPS | 011 |
| Geography | |
|---|---|
| Land area | 32.66 sq mi |
| Water area | 0.04 sq mi |
| Latitude | 38.9640 |
| Longitude | -75.8887 |
| Timezone | Eastern (ET) |
| Area code | 410/667 |
Total population by age
Gender
Race & ethnicity
Economics
updated 05/2026
Household income
| Income range | This ZIP | County avg | State avg |
|---|---|---|---|
| Under $50k | 38.2% | 40.1% | 28.2% |
| $50k – $100k | 36.9% | 34.3% | 28.2% |
| $100k – $200k | 19.6% | 21.3% | 30.1% |
| Over $200k | 5.3% | 4.3% | 13.4% |
Demographics & statistics
4,100
Population
126
People per sq mi
39.1
Median age
$78,922
Median household income
$34,527
Per capita income
$292,300
Median home value
$892
Median monthly rent
69.5%
Home ownership
5.9%
Poverty rate
5.4%
Unemployment
1,138
Housing units
18.0%
Bachelor's or higher
Age distribution
Male
Female
100
Under 5
128
115
5–9
149
106
10–14
137
153
15–19
198
58
20–24
75
230
25–34
297
278
35–44
357
254
45–54
327
125
55–59
161
112
60–64
145
110
65–74
141
108
75–84
140
42
85+
54
← Male
Female →
Age summary
| Group | Count | % |
|---|---|---|
| Under 18 | 977 | 23.8% |
| 18 and over | 3,123 | 76.2% |
| 65 and over | 595 | 14.5% |
| Median age | 39.1 years | |
Race & ethnicity
White
72.6%
Black or African American
17.5%
Two or more races
4.5%
Hispanic or Latino
2.3%
Asian
1.7%
Other race
1.4%
| Group | Count | % |
|---|---|---|
| White | 3,046 | 72.6% |
| Black or African American | 734 | 17.5% |
| Two or more races | 190 | 4.5% |
| Hispanic or Latino | 96 | 2.3% |
| Asian | 72 | 1.7% |
| Other race | 58 | 1.4% |
Household income
| Income range | This ZIP | County avg | State avg |
|---|---|---|---|
| Under $50k | 38.2% | 40.1% | 28.2% |
| $50k – $100k | 36.9% | 34.3% | 28.2% |
| $100k – $200k | 19.6% | 21.3% | 30.1% |
| Over $200k | 5.3% | 4.3% | 13.4% |
Under $10k
3.3%
$10k–$15k
1.6%
$15k–$25k
6.8%
$25k–$35k
3.0%
$35k–$50k
8.0%
$50k–$75k
23.2%
$75k–$100k
21.9%
$100k–$150k
19.9%
$150k–$200k
7.4%
$200k+
4.9%
| Range | % of households |
|---|---|
| Under $10k | 3.3% |
| $10k–$15k | 1.6% |
| $15k–$25k | 6.8% |
| $25k–$35k | 3.0% |
| $35k–$50k | 8.0% |
| $50k–$75k | 23.2% |
| $75k–$100k | 21.9% |
| $100k–$150k | 19.9% |
| $150k–$200k | 7.4% |
| $200k+ | 4.9% |
| Median income | $78,922 |
Housing
Home values
Under $50k
0.9%
$50k–$100k
1.7%
$100k–$150k
2.8%
$150k–$200k
10.1%
$200k–$300k
37.8%
$300k–$500k
34.0%
$500k–$1M
12.5%
Housing overview
| Metric | Value |
|---|---|
| Median home value | $292,300 |
| Median rent / month | $892 |
| Owner occupied | 69.5% |
| Renter occupied | 30.5% |
| Vacant | 5.2% |
| Single-family detached | 80.8% |
| Large apartment buildings | 2.0% |
| Mobile homes | 0.7% |
| Median rooms | 5.8 |
| Avg household size (owned) | 2.67 |
Year built
| Era | % |
|---|---|
| 2020 or later | 1.2% |
| 2010–2019 | 8.9% |
| 2000–2009 | 16.7% |
| 1990–1999 | 13.3% |
| 1980–1989 | 27.1% |
| 1970–1979 | 9.1% |
| 1960–1969 | 4.1% |
| 1950–1959 | 4.9% |
| 1940–1949 | 1.1% |
| 1939 or earlier | 13.6% |
Bedrooms
| Size | % of units |
|---|---|
| No bedroom (studio) | 0.9% |
| 1 bedroom | 7.9% |
| 2 bedrooms | 16.7% |
| 3 bedrooms | 47.6% |
| 4 bedrooms | 18.0% |
| 5+ bedrooms | 9.0% |
Vehicles per household
| Vehicles | % of households |
|---|---|
| No vehicle | 4.7% |
| 1 vehicle | 25.7% |
| 2 vehicles | 36.2% |
| 3 or more | 33.4% |
Heating fuel
| Fuel type | % |
|---|---|
| Utility gas | 3.2% |
| Electricity | 69.0% |
| Propane / LP gas | 11.0% |
| Fuel oil | 9.5% |
| Wood | 4.5% |
| Solar | 0.7% |
| No fuel used | 0.5% |
Households & families
| Household type | Count | % |
|---|---|---|
| Married-couple family | 774 | 51.0% |
| Cohabiting couple | 93 | 6.1% |
| Male householder, no spouse | 182 | 12.0% |
| Female householder, no spouse | 470 | 30.9% |
| Households with children under 18 | 518 | 34.1% |
| Households with seniors (65+) | 391 | 25.7% |
| Average household size | 2.62 | |
Marital status
| Status | Male | Female |
|---|---|---|
| Never married | 38.1% | 31.2% |
| Married | 54.8% | 43.5% |
| Separated | 0.5% | 1.2% |
| Widowed | 1.2% | 12.8% |
| Divorced | 5.4% | 11.3% |
Education
Less than 9th grade
2.7%
Some HS, no diploma
10.2%
HS graduate
41.3%
Some college, no degree
23.1%
Associate's degree
4.7%
Bachelor's degree
10.9%
Graduate / professional
7.1%
| Metric | % |
|---|---|
| HS diploma or higher | 87.1% |
| Bachelor's or higher | 18.0% |
School enrollment (ages 3–17)
| Type | Count | % |
|---|---|---|
| Nursery / preschool | 33 | 3.4% |
| Kindergarten | 125 | 12.9% |
| Elementary school | 358 | 36.9% |
| High school | 260 | 26.8% |
| College / grad school | 195 | 20.1% |
Employment
Industry of employment
Education & healthcare
26.2%
Construction
11.1%
Public administration
11.0%
Retail trade
10.8%
Other services
8.1%
Arts, food & hospitality
7.5%
Professional & management
7.3%
Transportation & utilities
7.2%
Manufacturing
3.9%
Finance & real estate
3.8%
Wholesale trade
1.8%
Agriculture & mining
1.1%
Information
0.1%
Occupation
| Category | % |
|---|---|
| Management, business & arts | 39.4% |
| Service | 17.6% |
| Sales & office | 18.1% |
| Natural resources & construction | 11.2% |
| Production & transportation | 13.7% |
Employment type
| Type | % |
|---|---|
| Private sector | 74.8% |
| Government | 21.9% |
| Self-employed | 3.3% |
| Unpaid family workers | 0.0% |
Commute
| Method | % |
|---|---|
| Drive alone | 81.1% |
| Carpool | 3.1% |
| Public transit | 0.0% |
| Walk | 4.7% |
| Work from home | 5.4% |
| Other means | 5.7% |
| Avg commute (minutes) | 38.1 |
Poverty
All people
5.9%
Under 18 years
6.3%
18 and over
5.8%
Married-couple families
1.0%
Female-led households
7.6%
Income support
| Source | % of households |
|---|---|
| Social Security | 29.0% |
| Retirement income | 16.7% |
| Supplemental Security | 9.9% |
| Cash public assistance | 4.5% |
| Food stamps / SNAP | 11.7% |
Health indicators
| Condition | % |
|---|---|
| Obesity | 38.4% |
| High blood pressure | 34.8% |
| High cholesterol | 33.7% |
| Diabetes | 11.5% |
| Heart disease | 5.9% |
| Stroke | 3.2% |
| Asthma | 11.0% |
| Arthritis | 26.9% |
| Kidney disease | 2.9% |
| Pulmonary disease | 7.3% |
| Cancer | 6.0% |
| Behavior / access | % |
|---|---|
| Smoking | 19.4% |
| Binge drinking | 15.1% |
| No physical activity | 26.2% |
| Less than 7 hrs sleep | 35.5% |
| Depression | 21.8% |
| Fair or poor health | 15.5% |
| Poor mental health | 16.6% |
| Poor physical health | 10.5% |
| No health insurance | 12.4% |
| Visited doctor (checkup) | 78.1% |
| Visited dentist | 59.2% |
| Cholesterol screening | 89.7% |
| Teeth loss | 14.4% |
Veterans & disability
| Veterans | Count | % |
|---|---|---|
| Civilian veterans | 218 | 7.0% |
| Disability | % |
|---|---|
| Any disability | 12.7% |
| Under 18 | 2.9% |
| 18–64 years | 11.9% |
| 65 and over | 32.1% |
Health insurance coverage
| Type | % |
|---|---|
| Private insurance | 66.7% |
| Public insurance | 43.1% |
| No insurance | 3.7% |
| Uninsured under 19 | 3.6% |
Language & origin
Language spoken at home (age 5+)
| Language | Count | % |
|---|---|---|
| English only | 3,872 | 94.4% |
| Spanish | 83 | 2.1% |
| Other Indo-European | 76 | 2.0% |
| Asian & Pacific Islander | 3 | 0.1% |
| Other languages | 4 | 0.1% |
Place of birth & citizenship
| Origin | Count | % |
|---|---|---|
| Native born (US) | 3,900 | 95.1% |
| Born in same state | 3,859 | 94.1% |
| Born in different state | 2,892 | 70.5% |
| Foreign born | 41 | 1.0% |
| Naturalized citizen | 200 | 4.9% |
| Not a US citizen | 66 | 33.0% |
Ancestry
| Ancestry | Count | % |
|---|---|---|
| Italian | 560 | 13.7% |
| Arab | 491 | 12% |
| French | 322 | 7.9% |
| Irish | 30 | 0.7% |
| Ancestry | Count | % |
|---|---|---|
| English | 22 | 0.5% |
| German | 15 | 0.4% |
| Dutch | 6 | 0.1% |
Technology access
| Metric | % of households |
|---|---|
| Computer access | 37.0% |
| Internet access | 94.4% |
Source: U.S. Census Bureau, American Community Survey 2025 estimates.
Frequently asked questions about ZIP code 21660
What city is ZIP code 21660 in?
ZIP code 21660 is primarily assigned to Ridgely, Maryland.
What county is ZIP code 21660 in?
ZIP code 21660 falls within Caroline County, Maryland.
What is the population of ZIP code 21660?
ZIP code 21660 has an estimated population of 4,100 residents, with a density of 126 people per square mile.
What is the typical home value in ZIP code 21660?
The median home value in ZIP code 21660 is $292,300.
What is the median household income in ZIP code 21660?
The median household income in ZIP code 21660 is $78,922, above the national median of ~$75,000.
What timezone is ZIP code 21660 in?
ZIP code 21660 observes the EST timezone.