The irregular county thus constituted is bounded on the northwest and north by Sullivan and Ulster Counties, on the east and southeast by the Hudson River and Rockland County, on the southwest and west by New Jersey, Pennsylvania and Sullivan County. It has nearly half a million square miles.
The towns along the northwestern and northern border are Deer Park, Mount Hope, Wallkill, Crawford, Montgomery and Newburgh.
Along the Hudson are Newburgh, New Windsor, Cornwall and Highlands.
Next to Rockland County are Highlands, Woodbury and Tuxedo.
On the New Jersey line are the point of Tuxedo, Warwick, Minisink, Greenville, and a section of Deer Park.
The most western town is Deer Park which lies along New Jersey, the Delaware River and Pennsylvania on the southwest and Sullivan County on the north.
In the interior are the towns of Wawayanda, Goshen, Hamptonburgh, Blooming Grove, Chester and Monroe.
The post offices of the county as distributed in the several towns are named as follows:
Blooming Grove: Salisbury's Mills, Washingtonville, Blooming Grove, Oxford Depot, Craigsville.
Chester: Chester, Greycourt, Sugar Loaf.