Based on the historical population data provided for the ZIP code 17870, which encompasses Selinsgrove in Pennsylvania, the area can be classified as a rural region transitioning towards a suburban rural lifestyle. The population density has remained relatively stable over the past decade, fluctuating between 327 and 342 people per square mile, which falls within the typical range of rural areas (50 to 500 people per square mile) and approaches the lower end of the suburban rural classification (500 to 1,000 people per square mile).

The estimated number of housing units corresponding to the 2022 population is 5,930, considering the national average household size of 2.61. This suggests that the area is characterized by larger living spaces and lower infrastructure density compared to more urbanized regions. The lifestyle in Selinsgrove likely revolves around community-oriented activities, with a focus on outdoor pursuits and a closer connection to the natural environment.

Over the past decade, the population has experienced minor fluctuations, with a slight overall increase from 15,597 in 2010 to 15,479 in 2022. This gradual growth indicates a slow but steady development in the area, possibly driven by the appeal of a more rural lifestyle combined with increasing access to suburban amenities. As the population density continues to rise, the area may experience a gradual shift towards a more suburban rural character, with the emergence of clustered housing developments and improved access to community services.