A change in the number of occupied housing units can be an indicator of a population change and economic growth in a region.

Lancaster County's rate of occupied housing has increased 2 percentage points since 2010-14 to a 97% occupancy rate in 2020-24. The City of Lancaster increased from 91% occupancy to 95% over this same period.

Lancaster has the highest rate of occupancy at 97% followed closely by Chester, Cumberland and York at 96%. At over 212,700 recorded housing units, Lancaster County has the largest stock of occupied housing of any surrounding county; only Chester is close, with about 204,800 occupied housing units.

The multi-year figures are from the Census Bureau's American Community Survey. The bureau combined five years of responses to the survey to provide estimates for smaller geographic areas and increase the precision of its estimates. However, because the information came from a survey, the samples responding to the survey were not always large enough to produce reliable results, especially in small geographic areas. CGR has noted on data tables the estimates with relatively large margins of error. Estimates with three asterisks have the largest margins, plus or minus 50% or more of the estimate. Two asterisks mean plus or minus 35% 50%, and one asterisk means plus or minus 20% 35%. For all estimates, the confidence level is 90%, meaning there is 90% probability the true value (if the whole population were surveyed) would be within the margin of error (or confidence interval). The survey provides data on characteristics of the population that used to be collected only during the decennial census.