Jacobus (/dʒɑːkoʊbʌs/) is a borough in York County, Pennsylvania, United States. The population was 1,829 at the time of the 2020 census.^[3] The borough is about 6 miles (9.7 km) south of downtown York.

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Jacobus, Pennsylvania
Borough
Post office
Location in York County and the U.S. state of Pennsylvania.
Jacobus Location of Jacobus in Pennsylvania Show map of Pennsylvania Jacobus Jacobus (the United States) Show map of the United States
Coordinates: 39°52′57″N 76°42′43″W
Country	United States
State	Pennsylvania
County	York
Settled	1837
Incorporated	1929
Government
• Type	Borough Council
• Mayor	Gregory B. Gruendler
Area [1]
• Total	0.93 sq mi (2.41 km2)
• Land	0.93 sq mi (2.41 km2)
• Water	0.00 sq mi (0.00 km2)
Elevation	623 ft (190 m)
Population  (2020)[2]
• Total	1,830
• Density	1,965.63/sq mi (759.19/km2)
Time zone	UTC-5 (Eastern (EST))
• Summer (DST)	UTC-4 (EDT)
Zip code	17407
Area code	717
FIPS code	42-37640
Website	www.jacobuspa.com

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Founded in 1837, Jacobus was originally called "New Paradise." The name was later changed because of misdelivered mail between New Paradise and the town of Paradise, in neighboring Lancaster County.

The name "Jacobus" was derived from the name of the town's postmaster, Jacob Geiselman (1829–1909). To correct the problem of the misdelivered mail, the United States Post Office Department notified Geiselman to change the name of the post office; however, Geiselman was unable to think of another name. Therefore, the mail was sorted and forwarded to Geiselman labeled as "Jacob-US Mail"; which was later shortened to "Jacob-US." The post office was then renamed Jacobus, and the town was renamed accordingly. In 1929, Jacobus became an incorporated borough under Pennsylvania law.^[4]

Jacobus is located at 39°52′57″N 76°42′43″W (39.882516, -76.712068).^[5]

According to the United States Census Bureau, the borough has a total area of 0.9 square miles (2.3 km²), all land.

As of the census^[7] of 2000, there were 1,203 people, 481 households, and 379 families living in the borough. The population density was 1,316.0 inhabitants per square mile (508.1/km²). There were 500 housing units at an average density of 547.0/mi² (212.1/km²).

The racial makeup of the borough was 99.42% White, 0.25% Native American, 0.17% Asian, and 0.17% from two or more races. Hispanic or Latino of any race were 0.25% of the population.

There were 481 households, out of which 31.0% had children under the age of eighteen living with them; 68.0% were married couples living together, 7.9% had a female householder with no husband present, and 21.2% were non-families. 19.3% of all households were made up of individuals, and 9.6% had someone living alone who was 65 years of age or older. The average household size was 2.49 and the average family size was 2.84.

In the borough the population was spread out, with 22.3% under the age of 18, 4.8% from 18 to 24, 28.2% from 25 to 44, 28.1% from 45 to 64, and 16.6% who were 65 years of age or older. The median age was 42 years. For every 100 females there were 94.3 males. For every 100 females age 18 and over, there were 90.4 males.

The median income for a household in the borough was $44,185, and the median income for a family was $52,500. Males had a median income of $35,903 versus $25,139 for females. The per capita income for the borough was $23,224. None of the families and 1.3% of the population were living below the poverty line, including no one under eighteen and 1.7% of those over 64.

Jacobus Borough is primarily served by Goodwill Fire Company (station 18) for fire services, Jacobus Ambulance (station 18) for emergency medical services, and York County Regional Police Department for law enforcement services.^[9]

The fire department operates 2 engines (Engines 18-1 and 18-2), a brush truck for brush fires (Brush 18), 3 boats (Boats 18-1, 18-2, and 18-3), a water rescue vehicle to move said boats, and a fire police unit (Traffic 18).^[10] The fire department also can function as a Quick Response Service (QRS) and can assist on medical 911 calls. The ambulance department is an Advanced Life Support capable unit, and operates 2 ambulances (Ambulance or MICU 18-1 and 18-2).