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Rio del Mar
Rio del Mar
Census-designated Place; Unincorporated community
	View of Rio del Mar and the Aptos Creek
	Location in Santa Cruz County and the state of California
	Rio del Mar Location in the United States
	Coordinates: 36°57′50″N 121°53′16″W / 36.96389°N 121.88778°W
Country	United States
State	California
County	Santa Cruz
Area
• Total	4.612 sq mi (11.945 km2)
• Land	3.001 sq mi (7.772 km2)
• Water	1.611 sq mi (4.173 km2) 34.94%
Elevation	144 ft (44 m)
Population (2020)
• Total	9,128
• Density	2,000/sq mi (760/km2)
Time zone	UTC-8 (PST)
• Summer (DST)	UTC-7 (PDT)
ZIP code	95003
Area code	831
FIPS code	06-60928
GNIS feature ID	1659513

Rio del Mar (Spanish: Río del Mar, meaning "River of the Sea") is an unincorporated village in Santa Cruz County, California. Rio del Mar is one of several small villages that form the unincorporated community of Aptos, California.^[3] Its population was 9,128 as of the 2020 United States census.^[2] For statistical purposes, the United States Census Bureau has defined Rio del Mar as a census-designated place (CDP).

Etymology

The name, from Spanish: Río del Mar, meaning river of the sea, was chosen to promote real estate in the area during the 1920s.^[4]

Geography

According to the United States Census Bureau, the CDP has a total area of 4.6 square miles (12 km²), of which, 3.0 square miles (7.8 km²) of it is land and 1.6 square miles (4.1 km²) of it (34.94%) is water. For statistical purposes, the United States Census Bureau has defined Rio del Mar as a census-designated place (CDP). The census definition of the area may not precisely correspond to local understanding of the area with the same name.

Aptos Creek goes through Rio del Mar and empties into the Monterey Bay.

Demographics

Historical population
Census	Pop.	%±
2000	9,198	—
2010	9,216	0.2%
2020	9,128	−1.0%
U.S. Decennial Census^[5]

2010

At the 2010 census Rio del Mar had a population of 9,216. The population density was 1,998.3 inhabitants per square mile (771.5/km²). The racial makeup of Rio del Mar was 8,310 (90.2%) White, 61 (0.7%) African American, 50 (0.5%) Native American, 313 (3.4%) Asian, 7 (0.1%) Pacific Islander, 188 (2.0%) from other races, and 287 (3.1%) from two or more races. Hispanic or Latino of any race were 899 people (9.8%).^[6]

The census reported that 9,210 people (99.9% of the population) lived in households, 6 (0.1%) lived in non-institutionalized group quarters, and no one was institutionalized.

There were 3,916 households, 1,050 (26.8%) had children under the age of 18 living in them, 2,082 (53.2%) were opposite-sex married couples living together, 337 (8.6%) had a female householder with no husband present, 139 (3.5%) had a male householder with no wife present. There were 228 (5.8%) unmarried opposite-sex partnerships, and 32 (0.8%) same-sex married couples or partnerships. 1,008 households (25.7%) were one person and 486 (12.4%) had someone living alone who was 65 or older. The average household size was 2.35. There were 2,558 families (65.3% of households); the average family size was 2.82.

The age distribution was 1,820 people (19.7%) under the age of 18, 549 people (6.0%) aged 18 to 24, 1,932 people (21.0%) aged 25 to 44, 3,221 people (35.0%) aged 45 to 64, and 1,694 people (18.4%) who were 65 or older. The median age was 47.0 years. For every 100 females, there were 92.6 males. For every 100 females age 18 and over, there were 90.2 males.

There were 4,924 housing units at an average density of 1,067.6 per square mile, of the occupied units 2,848 (72.7%) were owner-occupied and 1,068 (27.3%) were rented. The homeowner vacancy rate was 1.9%; the rental vacancy rate was 8.4%. 6,686 people (72.5% of the population) lived in owner-occupied housing units and 2,524 people (27.4%) lived in rental housing units.

2000

At the 2000 census there were 9,198 people, 4,008 households, and 2,549 families in the CDP. The population density was 3,077.3 inhabitants per square mile (1,188.2/km²). There were 5,022 housing units at an average density of 1,680.2 units per square mile (648.7 units/km²). The racial makeup of the CDP was 91.74% White, 0.61% African American, 0.53% Native American, 2.58% Asian, 0.16% Pacific Islander, 1.87% from other races, and 2.51% from two or more races. Hispanic or Latino of any race were 6.46%.^[7]

Of the 4,008 households 25.4% had children under the age of 18 living with them, 53.0% were married couples living together, 7.4% had a female householder with no husband present, and 36.4% were non-families. 26.0% of households were one person and 10.4% were one person aged 65 or older. The average household size was 2.29 and the average family size was 2.74.

The age distribution was 19.2% under the age of 18, 5.8% from 18 to 24, 26.8% from 25 to 44, 31.9% from 45 to 64, and 16.3% 65 or older. The median age was 44 years. For every 100 females, there were 92.3 males. For every 100 females age 18 and over, there were 90.9 males.

The median household income was $75,282 and the median family income was $85,355. Males had a median income of $70,612 versus $41,449 for females. The per capita income for the CDP was $39,034. About 3.1% of families and 6.3% of the population were below the poverty line, including 4.5% of those under age 18 and 4.6% of those age 65 or over.

Government

In the California State Legislature, Rio del Mar is in the 17th Senate District, represented by Democrat John Laird, and in the 29th Assembly District, represented by Democrat Robert Rivas.^[8]

In the United States House of Representatives, Rio del Mar is in California's 20th congressional district, represented by Republican Vince Fong.^[9]

Parks

Rio del Mar neighbors Seacliff State Beach, which features the remains of the cement ship, the SS Palo Alto. The ship was launched May 29, 1919. It was too late for duty in World War I, and after the war was beached as an entertainment boat, with amenities including a dance floor, a swimming pool and a cafe. The SS "Palo Alto" historically adjoined the beach by a fishing pier which was heavily damaged in the January 2023 storm and subsequently demolished.