For obtaining marriage records, you should write a letter listing all the details including date of the request, full name of the groom and the bride, date of the marriage, county where the marriage license was issued, the relationship of the requesting person to these individuals and the purpose for which information is accessed.

These marriage certificates are available at the local and county offices. You should attach the relevant documents along with the request letter. The letter can be mailed to or given in person to the officer in the office of vital statistics in the respective state.

http://www.vitalrecordsus.com/marriage-records.html

http://www.genwed.com/state/ilgen.htm

In most of the cases, the individuals might require the certified copies of these public records like birth, death, marriage and divorce records for several diverse purposes as in the application of passports, meeting the school entrance requirements, filling of license applications or in the seeking of insurance and government benefits.

These records are accessible to the individual or the immediate relatives. In Chicago, you will be able to get it from Public Health Division of Vital Records or from county clerks and circuit clerks. The Department of Vital Records is in wets Jefferson Street in Springfield in Illinois and is reached in the number 217 782 6553.

http://www.idph.state.il.us/vitalrecords/index.htm