Willow Street has experienced steady population growth over the past decade, increasing from 10,133 in 2013 to 12,173 in 2022. This 20% population increase may have contributed to the need for affordable housing, leading to the Willow Run project's completion in 2015.

The median income in Willow Street has also seen a significant rise, from $72,451 in 2013 to $85,980 in 2022. Despite this overall increase in median income, the presence of LIHTC-funded housing suggests there is still a segment of the population requiring affordable housing options.

Racial demographics in Willow Street have shown some changes over the past decade. While the city remains predominantly white, there has been a slight decrease in the white population from 94% in 2013 to 85% in 2022. Concurrently, there have been small increases in Asian, Black, Hispanic, and multi-racial populations. This gradual diversification may influence future affordable housing needs and planning.

Willow Street's LIHTC-funded affordable housing inventory consists of one project, Willow Run, completed in 2015. This project provides 72 units, with 61 designated as low-income units, representing about 1.54% of the city's estimated housing inventory. The city has received over $1.3 million in LIHTC funding, accounting for 0.22% of Pennsylvania's total LIHTC allocation. Despite rising median incomes, the presence of this LIHTC project indicates an ongoing need for affordable housing in the community. As the population continues to grow and diversify, it will be important to monitor how these demographic shifts may impact future affordable housing requirements in Willow Street.