1900 Census microfilms at Internet Archive

Reel 944. Belknap and Carroll Counties
Reel 945. Cheshire and Coos Counties
Reel 946. Grafton County
Reel 947. Hillsborough County (part: EDs 76--92, 273, 93-108)
Reel 948. Hiilsborough County (cont'd: ED 109-end)
Reel 949. Merrimack County
NReel 950. Rockingham County
Reel 951. Strafford County (part: EDs 219-232)
Reel 952. Stratford (cont'd: ED 233-end) and Sullivan Counties