|Area||1.36 sq mi (4 km2)|
|- land||1.35 sq mi (3 km2)|
|- water||0.01 sq mi (0 km2)|
|Density||1,940.8 / sq mi (749 / km2)|
|- summer (DST)||CDT (UTC-5)|
Zeigler is located at (37.899856, -89.053429).
According to the 2010 census, the city has a total area of 1.36 square miles (3.5 km2), of which 1.35 square miles (3.5 km2) (or 99.26%) is land and 0.01 square miles (0.026 km2) (or 0.74%) is water.
As of the census of 2000, there were 1,669 people, 712 households, and 439 families residing in the city. The population density was 1,940.8 people per square mile (749.3/km²). There were 809 housing units at an average density of 940.8/sq mi (363.2/km²). The racial makeup of the city was 98.86% White, 0.18% African American, 0.06% Native American, 0.12% Asian, and 0.78% from two or more races. Hispanic or Latino of any race were 0.48% of the population.
There were 712 households out of which 27.7% had children under the age of 18 living with them, 47.1% were married couples living together, 10.5% had a female householder with no husband present, and 38.3% were non-families. 34.7% of all households were made up of individuals and 19.2% had someone living alone who was 65 years of age or older. The average household size was 2.28 and the average family size was 2.94.
In the city the population was spread out with 22.5% under the age of 18, 8.5% from 18 to 24, 28.2% from 25 to 44, 22.3% from 45 to 64, and 18.6% who were 65 years of age or older. The median age was 39 years. For every 100 females there were 92.9 males. For every 100 females age 18 and over, there were 89.2 males.
The median income for a household in the city was $22,344, and the median income for a family was $30,776. Males had a median income of $27,721 versus $17,500 for females. The per capita income for the city was $13,781. About 13.7% of families and 17.5% of the population were below the poverty line, including 27.1% of those under age 18 and 7.6% of those age 65 or over.
- Nick Holonyak, invented the first practically useful visible LED in 1962; born in Zeigler
- Babe Martin, outfielder and catcher for the St. Louis Browns and Boston Red Sox; grew up in Zeigler.
- Mike Milosevich, shortstop for the New York Yankees; born in Zeigler
- "US Gazetteer files: 2010, 2000, and 1990". United States Census Bureau. 2011-02-12. Retrieved 2011-04-23.
- "2010 Census U.S. Gazetteer Files for Places – Illinois". United States Census. Retrieved 2012-10-13.
- "American FactFinder". United States Census Bureau. Retrieved 2008-01-31.
- http://www.zeigleril.com Zeigler's official website