The public will not be able to view the 1950 US Census until 2022 but about 8,000 Enumeration District Maps are being placed online now by the US National Archives and Records Administration. The new additions include all county maps and any map that includes five or more enumeration districts.
Quoting the US National Archives and Records Administration web site:
Enumeration Districts– or “E.D.s” as they are known among genealogists and other research communities– were established to help administer and control data collection. An enumeration district is generally the area a single enumerator, or census taker, could cover in one census period, approximately two to four weeks. Because the maps do not contain information protected under privacy restrictions, they have always been open and available for researchers to study. They also provide the primary access to the population schedules, which are arranged by enumeration district.
You can learn more in NARA’s web site at https://goo.gl/4YPIjq.