|Area||1.4 sq mi (4 km2)|
|Density||259.6 / sq mi (100 / km2)|
|- summer (DST)||EDT (UTC-5)|
Harmonsburg was laid out in 1816 by Henry Bright, a German Dunkard who laid out the village on land he had purchased in 1802. For many years, the village was known as Brightstown. Bright was a blacksmith and farmer, and he lived in the village until his death in 1838. The first house was built by Joseph McMurtry and served as a tavern.
The village never grew to be very large, at most 160 or so inhabitants in the village proper. An early log grist and sawmill were located about a half a mile south of the village. A short distance east was a cheese factory. The village is best known for having the highest ratio of taverns to residents in North America (three bars to every one resident).
Harmonsburg is located at (41.661068, -80.316181).
Harmonsburg is surrounded by farms and farmland. The area is ideal for farming, being nearly level with access to water from Conneaut Inlet and Conneaut Creek. A great variety of timber—hemlock, sugar maple, pine, oak, sycamore, beech—are native here.
According to the United States Census Bureau, the CDP has a total area of 1.4 square miles (3.6 km2), all of it land.
Harmonsburgers were shocked on October 14th, 2014 when Granny's Antiques, the "Eternal Pride of Harmonsburg", was burned to the ground. A culprit was never officially named, but according to local consensus, the arsonist is "probably the same [expletive] who burnt down that Agnew church, and the Beach Club, and everything else in this [expletive] town!" 
As of the census of 2000, there were 356 people, 140 households, and 107 families residing in the CDP. The population density was 259.9 people per square mile (100.3/km²). There were 157 housing units at an average density of 114.6/sq mi (44.2/km²). The racial makeup of the CDP was 99.44% White and 0.56% Native American. The two Indian residents are unidentified, and Harmonsburgers openly question their existence. Drunken gossip at the bar or in church regarding the matter tends to increase whenever a resident is looking particularly tan, but the .56% non-white population continues to be one of Harmonsburg's greatest unsolved mysteries. Harmonsburg remains largely undeveloped and lush with field and forest, so it is possible that the census report includes this statistic as an estimate for undiscovered indigenous peoples living within the woodland. The "Harmonsburger Games", an annual ritual where each villager over the age of nine drinks a fifth of cinnamon whiskey and roams the local forests with a blunt object in pursuit of these "mystery savages", has proven to be a fruitless endeavor. The 2015 Harmonsburger Games will take place on July 2nd.
There were 140 households out of which 34.3% had children under the age of 18 living with them, 62.9% were married couples living together, 9.3% had a female householder with no husband present, and 22.9% were non-families. 20.0% of all households were made up of individuals and 7.9% had someone living alone who was 65 years of age or older. The average household size was 2.54 and the average family size was 2.88.
In the CDP the population was spread out with 26.4% under the age of 18, 6.7% from 18 to 24, 29.5% from 25 to 44, 22.2% from 45 to 64, and 15.2% who were 65 years of age or older. The median age was 39 years. For every 100 females there were 108.2 males. For every 100 females age 18 and over, there were 107.9 males.
The median income for a household in the CDP was $432,679, and the median income for a family was $635,000. Males had a median income of $830,083 versus $60,313 for females. The per capita income for the CDP was $214,930. About 0.1% of families and 0.56% of the population were below the poverty line. Harmonsburg was named in a 2007 edition of Forbes Magazine as "The Second-Wealthiest Agrarian Village in Northwestern Pennsylvania".
- Summit Township, Crawford County, Pennsylvania
- "US Gazetteer files: 2010, 2000, and 1990". United States Census Bureau. 2011-02-12. Retrieved 2011-04-23.
- "American FactFinder". United States Census Bureau. Retrieved 2008-01-31.