Federal Populations Schedules.

• Indexed—1830, 1840, 1850, 1860, 1870
• The Arkansas History Commission has an excellent collection of compiled and/or published federal censuses and census indexes for most of the state's counties in addition to microfilm copies of all federal censuses for the state. 

• Soundex—1880, 1900, 1910 (Miracode), 1920

State Schedules.

" A collection of French and Spanish records that lists early Europeans in Arkansas between 1686–1804 is Morris S. Arnold and Dorothy Jones Core, comps. and eds., Arkansas Colonials.
  Federal territorial census records for 1810 included those settlements in the Arkansas District of Hopefield (West Memphis), St. Francis, and settlements along the Arkansas River, but these enumerations were lost. The 1820 federal territorial census included Miller County, which was organized that year by the Arkansas territorial government but actually was partially in Texas under Spanish control. This census was also lost.
  Arkansas Territory sheriffs were to enumerate the citizens biennially beginning in 1823. Although these censuses were recorded in 1823, 1825, and 1827, only the 1823 schedule for Arkansas County remains of the three early enumerations. The 1829 sheriff's census includes the name of the head of household, but only fragments remain. Those counties for which complete returns are available are Arkansas, Chicot, Clark, Conway, Crawford, Crittenden, Independence, Lawrence, Miller (old), St. Francis, and Washington. None are available for Pope or Sevier counties, and only the total number of inhabitants were submitted by the sheriffs of Hempstead, Izard, Lafayette, Phillips, and Pulaski counties."

Industry and Agriculture Schedules.

• 1850, 1860, 1870, 1880

Mortality Schedules.

• 1850, 1860, 1870, 1880

Slave Schedules.

• 1850, 1860

"The original agriculture, industry, and mortality schedules are maintained by the Special Collections Library of the University of Arkansas. Microfilm copies of the agriculture, industry, mortality, and slave schedules are housed at the Arkansas History Commission. Originals of the slave schedules are at the National Archives.
  The Arkansas Genealogical Society is currently sponsoring a statewide program to reconstruct the missing 1890 federal census with compilations of tax and other local records for that period. Of the seventy-five counties in Arkansas, sixty-six have a completed replacement of the 1890 federal census. Only Grant, Chicot, Drew, Hot Spring, Franklin, Poinsett, Sharp, Woodruff, and a portion of Lee counties remain to be finished. The Arkansas Genealogical Society should be contacted for the current status of the project."

(Source:  Ancestry's Red Book: American State, County, and Town Sources )