The U.S Bureau of Labor Statistics (BLS) (citation, USDL-18-0154) writes:

Due to a lapse in funding, some agencies of the federal government were shut down or were operating at reduced staffing levels from January 20, 2018, through January 22, 2018.

All household data collection was suspended during the shutdown. Household survey data collection resumed on January 23, 2018, and was conducted through January 26, 2018, to allow for the usual number of collection days. The response rate for the household survey in January 2018 was slightly below the average rate for 2017.

In the establishment survey, collection of data by interviewers was suspended on January 22, 2018, and resumed on January 23, 2018. Electronic data collection was not interrupted. Collection rates for the establishment survey for this collection period were within the normal range.

Overall, there were no discernible effects on the national unemployment rate and other major household survey measures, or on the estimates of total nonfarm payroll employment, for the month of January.