The loan period runs from 28 Aug – 27 September 2014 inclusive and there is no recall provision within the first month.
To date, Dudley-born Brown has made a total of nine first team appearances for Blues, but just one so far this season. That was when he figured in the 1-0 home victory against Brighton & Hove Albion
at St. Andrew's earlier this month.
It is a first time out on loan for the 18-year-old.
County, who are managed by Shaun Derry, have made a decent start to their 2014/15 campaign, with two wins, a draw and a defeat from their opening four league fixtures.