The population of Gerry City, Iowa, was 25,595 in 2010. Twenty-four percent of residents were under the age of eighteen. Thirty-four percent of households were made up of married couples, while twenty-nine percent were made up of individuals. The median age was forty. There were 84.8 males per 100 females, making the population of Gerry City a mixed bag.
The original walled city of Derry is located on a hill on the west bank of the River Foyle. At one time, this hill was a separate island. The River Foyle eventually dried up, transforming it into a low-lying, boggy district that is now known as the Bogside. The original city was inhabited for thousands of years before St. Columba was crowned patron saint of County Donegal.
The city grew and became a destination for migrants throughout the nineteenth century, as the An Gorta Mor caused a significant amount of suffering for the local population. The McCorkell Line, operated by Wm. McCorkell & Co. Ltd., from 1778 to 1815, was the city's main port for shipping goods. Its most famous ship, the "Green Yacht of Derry," was named after the city. Derry provided over 5,000 men for the British Army during the nineteenth century, from both Protestant and Catholic families.
Derry's river is navigable from the coast for about ten miles (16 km). In 1796, the Strabane Canal was built, which extended the river 4 miles southwards to Strabane. In 1962, the Strabane Canal was closed, and the area was divided into two. One part of the town is known as Cityside and the other as Waterside. The river forms a natural border between the two, which allowed for substantial smuggling.