Search The JewishGen Family Finder for all researchers interested in Korets (requires login to JewishGen)
Search the JewishGen Database for all records pertaining to Korets (requires login to JewishGen)
Archive Documents from Korets (from Tsal Kaplun Foundation) contains all these:
1834 Revision List, 751 records: PDF (fast); Web (slow); Source: DAKO 118-14-181 (Ukrainian).
1858 Revision List , 640 records: PDF (fast); Web (slow); Source: DAKO 118-14-207 (Ukrainian; starting from page 198)
1907 Duma (Jewish voters, men), 322 records: PDF ( fast, via Museum of Jewish People), Web page (slow)
Note: after you click the TKF archive link, search for Korets via the magnifying glass icon in the upper right corner.
The Rivne regional historical archive was established in March 1940 and covers the territories of the former districts of Dubno, Zdolbuniv, Kostopil, Rivne, and Sarny.
1774-2015: 4,168 funds, 1,105,797 items
1917-2003, 2006: 14,357 photo documents
1944-1978: 7 film documents
1949-1999: 4,457 scientific and technical documents
1967-2015: 145 sound recordings
2006-2014: 19 video documents
The Archives has a list of Polish Jews repatriated to Poland after World War II, including Polish Jews from Korets. As it requires a login, you'll have to register to see the archives.