Its territory, which is now in northern Hungary, was slightly larger than that of present Heves county.

Following the failed Hungarian Revolution of 1848 a period of military dictatorship and centralisation began in Hungary.

Heves-Külső-Szolnok was re-partitioned on 13 September 1850 into Heves and Szolnok counties.

The traditional counties of Hungary, including Heves-Külső-Szolnok, were restored in October 1860.

Its territory after 1876 was broadly similar to its 1850s iteration but with the addition of Tisza-Füred south of the Tisza.