Marriott-Slaterville is a city in Weber County, Utah, United States. The population was 1,701 at the 2010 census. It is part of the Ogden–Clearfield, Utah Metropolitan Statistical Area. The city was incorporated in July 1999, in a merger of the previously unincorporated communities of Marriott and Slaterville.
According to the United States Census Bureau, the city has a total area of 7.5 square miles (19.3 km²), of which, 7.3 square miles (19 km) of it is land and 0.2 square miles (0.52 km) of it (2.68%) is water.
As of the census of 2000, there were 1,425 people, 458 households, and 381 families residing in the city. The population density was 196.4 people per square mile (75.8/km²). There were 471 housing units at an average density of 64.9 per square mile (25.0/km²). The racial makeup of the city was 96.14% White, 0.21% Native American, 0.49% Asian, 0.07% Pacific Islander, 2.11% from other races, and 0.98% from two or more races. Hispanic or Latino of any race were 3.37% of the population.
There were 458 households out of which 38.4% had children under the age of 18 living with them, 70.1% were married couples living together, 7.9% had a female householder with no husband present, and 16.6% were non-families. 14.2% of all households were made up of individuals and 6.3% had someone living alone who was 65 years of age or older. The average household size was 3.11 and the average family size was 3.43.
In the city, the population was spread out with 29.4% under the age of 18, 10.7% from 18 to 24, 25.9% from 25 to 44, 23.1% from 45 to 64, and 10.9% who were 65 years of age or older. The median age was 34 years. For every 100 females, there were 102.1 males. For every 100 females age 18 and over, there were 105.7 males.
The median income for a household in the city was $49,732, and the median income for a family was $57,083. Males had a median income of $41,466 versus $27,788 for females. The per capita income for the city was $19,534. About 5.9% of families and 7.3% of the population were below the poverty line, including 6.4% of those under age 18 and 8.5% of those age 65 or over.