Even though it is the county seat, thus containing most of the local government offices, it actually is one of the smaller cities in the area. As growth from Houston appears to be spreading past Sugar Land, this could change in the not-too-distant future—given the current trends in the Richmond–Rosenberg area.
According to the United States Census Bureau, the city has a total area of 3.9 square miles (10.2 km²), of which, 3.7 square miles (9.6 km²) of it is land and 0.2 square miles (0.6 km²) of it (5.58%) is water.
There were 3,413 households out of which 39.6% had children under the age of 18 living with them, 53.6% were married couples living together, 16.4% had a female householder with no husband present, and 23.0% were non-families. 18.7% of all households were made up of individuals and 6.7% had someone living alone who was 65 years of age or older. The average household size was 3.16 and the average family size was 3.60.
In the city the population was spread out with 31.6% under the age of 18, 11.0% from 18 to 24, 28.5% from 25 to 44, 18.7% from 45 to 64, and 10.1% who were 65 years of age or older. The median age was 30 years. For every 100 females there were 98.1 males. For every 100 females age 18 and over, there were 95.2 males.
The median income for a household in the city was $44,888, and the median income for a family was $45,801. Males had a median income of $37,457 versus $32,723 for females. The per capita income for the city was $25,195.
Six elementary schools—Austin, Long, Pink, Seguin, Smith, and Velasquez—are located in and serve Richmond.
Wessendorff Middle School, Lamar Junior High School, and Lamar Consolidated High School serve Richmond. The three schools are in Rosenberg.
Various schools operated by LCISD and neighboring Fort Bend Independent School District bear Richmond addresses, but do not serve the city of Richmond. Foster High School and Briscoe Junior High in LCISD and Travis High School and Bush High School in the FBISD bear "Richmond, Texas" addressed but do not serve the city of Richmond and are not located in or near the city of Richmond.