The Borough of Hi-Nella was created on April 23, 1929, from Clementon Township, one of seven municipalities created from the now-defunct township, and one of five new municipalities (joining Lindenwold, Pine Hill, Pine Valley and Somerdale) created on that same date.
According to the United States Census Bureau, the borough has a total area of 0.2 square miles (0.6 km²), all of it land.
Hi-Nella borders Gloucester Township, Somerdale, and Stratford.
There were 472 households out of which 28.0% had children under the age of 18 living with them, 31.6% were married couples living together, 16.3% had a female householder with no husband present, and 44.9% were non-families. 36.4% of all households were made up of individuals and 9.3% had someone living alone who was 65 years of age or older. The average household size was 2.18 and the average family size was 2.83.
In the borough the population was spread out with 25.0% under the age of 18, 10.5% from 18 to 24, 36.3% from 25 to 44, 14.5% from 45 to 64, and 13.7% who were 65 years of age or older. The median age was 32 years. For every 100 females there were 89.2 males. For every 100 females age 18 and over, there were 87.8 males.
The median income for a household in the borough was $34,948, and the median income for a family was $38,393. Males had a median income of $32,308 versus $25,759 for females. The per capita income for the borough was $19,285. About 9.9% of families and 12.2% of the population were below the poverty line, including 10.7% of those under age 18 and 6.3% of those age 65 or over.
For grades 9 - 12, public school students attend Sterling High School, a regional high school serving students from Magnolia, Somerdale, Stratford, along with the sending districts of Hi-Nella and Laurel Springs. The high school is located in Somerdale. Prior to this agreement, Hi-Nella students attended Collingswood High School.