Ontario sits four miles from Mansfield and shares the same 1938 to 1983 building wave that shaped most of this end of Richland County. Lexington, six miles out, and Lucas, seven miles out, both sit inside that pre-1960 belt too - original torsion springs on steel doors are common, and the openers are due for a swap if they haven't been already. Bellville and Shelby, ten and eleven miles away, mix in a bit more newer construction, though pre-1960 stock still dominates the neighborhoods closest to their old town cores. Crestline sits eleven miles out. Ashland and Galion, both thirteen miles, Perrysville and Hayesville at fourteen, Shiloh at fifteen, Tiro at sixteen - the pattern holds across all sixteen towns we cover: most of the housing went up between 1938 and 1983, median build year 1957. That means original hardware, narrow tracks, and springs rated for lighter doors than what people hang on them now, on a lot of these doors. Jeromesville, Loudonville, and Greenwich at eighteen miles, and Fredericktown at twenty, round out the far edge of where we'll drive. Farther out doesn't change the housing pattern, it just changes the drive time.