Wilton is a census-designated place (CDP) in Sacramento County, California, United States.

[3] According to the United States Census Bureau, the CDP has a total area of 29.0 square miles (75 km2), all of it land.

Historically the Wilton vicinity has been a locale of considerable haying and pasture usage; the depth to groundwater is typically about 150 to 175 feet (46 to 53 meters).

Because some areas of Wilton are in a flood zone, water can be in the streets during the rainy season.

In 1997, an El Nino/La Nina year, levees broke and some homes were flooded to the rooftops.

On New Years Eve of 2022, parts of Wilton were evacuated due to a flood warning after levee breaches on the Cosumnes River.

284 households (15.2%) were made up of individuals, and 124 (6.6%) had someone living alone who was 65 years of age or older.

There were 2,090 housing units at an average density of 72.1 per square mile (27.8/km2), of which 1,620 (86.9%) were owner-occupied, and 245 (13.1%) were occupied by renters.

Federally, Wilton is in California's 7th congressional district, represented by Democrat Doris Matsui.