870 Area Code: Jonesboro, Arkansas

The 870 code covers eastern, southern, and northwestern Arkansas — most of the state, in fact, outside the central and northwest corners. Jonesboro, in the Crowley's Ridge region of northeast Arkansas, anchors the directory's records for the code. The city sits on a low loess ridge running through the otherwise flat Mississippi alluvial plain, and its working economy revolves around agriculture, manufacturing, a regional medical center, and Arkansas State University's main campus. The 870 footprint reaches across Delta cropland, Ouachita timber country, and the Ozark foothills, taking in a large but sparsely populated share of the state.

Records linked to 870 numbers in the directory frequently include Fayetteville and Little Rock — Arkansas cities that fall outside this code's geography. Their appearance is driven by the standard ways phone numbers travel: porting, prior registration, and address linkages that don't respect area-code boundaries. We currently document 549 distinct prefixes within 870 in detail, which is a working subset of the prefixes the code actually carries; the underlying figure runs higher.

A few notes on the place itself. Jonesboro's median age skews younger than the US figure, and household income runs below the national median. Home values come in well under the US level, in line with much of regional eastern Arkansas. The city's population is modest in absolute terms but relatively large for the rural Delta-and-foothills swath of the state that the 870 code blankets, where most communities are considerably smaller.