A report by the Ohio Department of Rehabilitation and Correction finds jails should do everything they can to maintain populations appropriate to the size of the facility.
Allen County's Justice Center was built in 1990 and at the time was a "state of the art" facility.
The report also recommended that jails reduce the number of inmates they hold who are awaiting trial and avoid the use of temporary beds whenever possible.
The report also calls for limiting new inmates' booking waits to under 90 minutes and provide a suitable area for inmates who are under suicide watch.
The report also criticizes security policies that call for jailers to move through facilities to keep an eye on inmates, saying it's more efficient when guards remain in the same area.
Allen County Sheriff's Chief Deputy Jim Everett says their facility should not have too much difficulty complying with the recommendations.
The prisons system will study the report as it revises standards for Ohio jails.