There are several reasons why data may not be available for a few zip codes:

CNI scores are not calculated for non-populated ZIP codes. These include such areas such as national parks, public spaces, post office boxes, and large unoccupied buildings.

CNI scores for ZIP codes with small populations (especially less than 100 people) may be less accurate. This is due to the fact that the sample of respondents to the census is too small to provide accurate statistics for such ZIP codes. This issue is mitigated by either eliminating such ZIP codes from your analysis completely, or by making sure that low population ZIP codes are combined with other surrounding high population ZIP codes using the weighted average technique.

Community Need Index
Methodology and Source Notes