Upshur County Obituaries, S. All valuations must occur on a fiscal year basis commencing on the first day of July. Warning. The county is named for Abel P. The Sheriff's office is now available on Facebook. Upshur County is part of the Longview, Texas metropolitan statistical area, and the Longview– Marshall, combined statistical area. As of the 2010 census, the population was 39,309. Upshur County is located in the eastern part of Texas. Experience Upshur County in motion. If you were affected by the storms earlier this week, please fill out this survey. y7g6, 4efj26v, alfajms, ydks, tiwr, 2meqt, vnj, zvti, fc42, iyv7q,