Counties in Connecticut have no governmental function: all legal power is vested in the state, city, and town governments. The office of High Sheriff in Connecticut counties was officially abolished by ballot in 2000, and corrections and court service were transferred to the state marshalls.
Tolland County has the same boundaries as the Tolland Judicial District.
Tolland County is incorporated into thirteen towns and was originally formed in 1785 from towns in Windham County, Connecticut .
According to the 2000 census, the county has a total area of 417.01 sqmi (1080050941.9 m2), of which 410.07 sqmi (1062076424.4 m2) (or 98.34%) is land and 6.94 sqmi (17974517.5 m2) (or 1.66%) is water.
Part of the county is part of the Hartford metropolitan area and part is part of the Springfield, Massachusetts, metropolitan area.
The FIPS code for Tolland County is 009013.