Consult the original by looking on film or visiting the NCAchives. Yours truly found her ancestors accidentally omitted. Understand the census quirks for population censuses 1790 to 1920. All censuses for Nash Co survived for this time period. Many resources and books on the census and special schedules are available at your local libraries.
Many censuses are online, but with each recopying is a possible level of error.
Always recheck the census yourself. In a study, Winslow disovered that by comparing, for example, Perquimans County to the federal copy on film with the state copy at the NC Archives, the NC Archive copy lists the county of birth for North Carolinians, while the federal on film showed NC as a birthplace. Knowing the day of the census will help in determining age. Be creative with spelling the name. Many people who moved our of county and state authorized a party to act on his or herself.