In Rapid City, sheriffs are quite numerous and I am sure that you may be considered. Pennington County covers a large area of the state and with the growing population and suburbs, I am guessing that sheriffs are needed throughout the metro area.
You may also want to consider Sturgis which is about 20 miles northwest of Rapid City. It is the seat of Meade County and it is growing VERY fast out that way. Rapid City is on the county line and many people build in Meade County to avoid the high taxes of Rapid City. Sturgis probably has few sheriffs and probably needs them more than Rapid City to control Rapid City's urban runoff. Plus, Interstate 90 is very congested northwest of Rapid City and I hardly ever see law enforcement out there.
Try both cities! Good Luck!