Transcribed records found here and on other sites.
Holdings of the Illinois State Archives.
Microfilms available for sale or rent from the National Archives and Records Administration.
Commercial sites which sell census microfilm or census cd's for Henderson County. Many of those sites are listed on the USGenWeb Census Project Resource page.
Probate & Civil Court 1825-1840 - Circuit Court, Warren Co.
Probate, & Civil from 1841 - Circuit Court, Henderson Co.
Divorce from 1841 - Circuit Court, Henderson Co.
Records at IRAD can be obtained for only the cost of photocopying! You may search for their holdings of Henderson County Records and then see the IRAD Research Policy to see where to send your request.
The IRAD holdings currently include birth records from 1877-1901; birth record index from 1877-1915; county annual audit reports from 1962-1972; death records from 1878-1902; death record index from 1878-1915; marriage records from 1841-1901; marriage record index from 1841-1934; school district annual audit reports from 1958-1969; school treasurer's cash books from 1838-1859; and school trustees' minutes from 1857-1901.
The LDS Church has microfilmed most vital records, county history and biography books, and many other records for every county of every state. Their libraries are free for the use of everyone - you do NOT need to be a member of their church to use their facilities. The microfilms included in the holdings for Henderson County can be rented from any Family History Library for a small fee. This search of their library holdings will give you the microfilm numbers you will need to place your order.
You may also use this library search to search for microfilmed records of your surname, or download free genealogical software from this site.
To find a Family History Center near you, search here.
These searches may also be reached through the primary FamilySearch Internet Genealogy Service site.