Duplin County census information/sources:
- 1784-1786 NC State Census records for Duplin County
- 1790 Census – at the Archives
- 1790 Duplin County Census-transcribed
- 1800 Duplin County Census-transcribed
- 1850 US Census – free search & images @ FamilySearch
- 1850 US Census (Mortality Schedule) – (FamilySearch)
- 1870 US Census – (FamilySearch)
- 1880 US Census – (FamilySearch)
- 1900 US Census – (FamilySearch)
- 1910 US Census – (FamilySearch)
- 1920 US Census – (FamilySearch)
- 1930 US Census – (FamilySearch)
- 1940 US Census – (FamilySearch)
You may also wish to check the USGenWeb Duplin County Archives census data.