Population
In 2007, the estimated population of Sheridan County was 27,998. It is estimated that the population in 2010 will be 28,750.
Population & Projections
| Sheridan (City) | Entire County | |
| 2006 | 16,510 | 27,477 |
| 2008 | 16,861 | 28,662 |
| 2010 | 17,124 | 28,750 |
The current population is 48.26% male and 51.74% female.
Median Age:
In 2006 the median age of the population was 41.8 up from 40.0 in 2003.
Households:
In 2006 there were an estimated 12,034 households in Sheridan. The 2000 Census revealed household counts of 11,167, up from 9,427 in 1990, representing a change of 18.5%. It is estimated the number of households in Sheridan in 2010 will be 12,556, representing a change of 12.4% from 2000.