1st Division - Kuching
1839 – James Brooke found Cochin ( Kuching )
1841, September 24th – Pangeran Muda Hashim and James Brooke signed a treaty, ceding Kuching to Brooke, from Tanjung Datu to Kuala Sungai Samarahan.
1842, August 18th - James Brooke declared Rajah of Sarawak.
1853, Sultan Omar Ali Saifudin of Brunei ceded Samarahan and Sadong to Brooke.
1873, June 1st – Establishment of First Division, along with Second Division and Third Division.
1876 – Kuching upgraded to Town status
1983, August 11th - Establishment of Padawan Sub-District
1986, July 24th – Establishment of Samarahan Division. Simunjan, Serian and Samarahan Districts alienated to Samarahan Division.
1988, August 1st – Kuching upgraded to City status.
2nd Division - Sri Aman
1873, June 1st – Establishment of Second Division, along with First Division and Third Division.
1957 – Establishment of Lubuk Antu District
1973, October 21st –Sri Aman Declaration, a peace treaty with PARAKU ( Party Rakyat Kalimantan Utara, a communist party ) signed. Simanggang renamed Sri Aman.
1986, July 24th – Establishment of Samarahan Division. Sub-District Sebuyau realigned to Simunjan District within Samarahan Division.
2002, March 26th – Establishment of Betong Division. Saribas and Kalaka Districts realigned to Betong Division.
3rd Division - Sibu
1853 – Maling ceded to Sarawak
1859 – Mukah ceded to Sarawak
1873, June 1st – Establishment of Third Division, along with First Division and Second Division. Maling renamed Sibu.
1901 – Wong Nai Siong lead Foochows from China.
1949 – Establishment of Kanowit District
1973, April 2nd – Establishment of Sarikei and Kapit Divisions. Sarikei, Binatang, Matu-Daro, Julau Districts and Pakan Sub-Districts alienated to Sarikei Division. Kapit, Belaga and Song Districts alienated to Kapit Division
2002, March 1st – Establishment of Mukah Division. Mukah and Dalat Districts alienated to Mukah Division.
4th Division - Miri
1861 – Kidurong ceded to Sarawak
1882 – Brunei alienated Bintulu and Baram to Sarawak
1885, Jul 28th – Establishment of Fourth Division
1910, August 10th – Shell began oil-digging operation in Canada Hill.
1912 - Administrative center of Miri Division shifted from Marudi to Miri.
1912 - Administrative center of Miri Division shifted from Marudi to Miri.
1953 – Subis Sub-District established within Niah District.
1987, January 1st – Establishment of Bintulu Division. Bintulu and Tatau Districts alienated to Bintulu Division.
2005, May 20th – Miri ungraded to City status.
5th Division - Limbang
1882, June 19th – Claude town found
1885 – Alfred Everett bought Sg Pandaruan
1885 – Trusan ceded to Sarawak
1890, March 17th – Sg Limbang & Pengkalan Tarap ceded to Sarawak
1901 – Brunei sold Lawas to North Borneo Company
1905, January 5th – Lawas bought from North Borneo Company
1913 – Sg Panaruan bought from Alfred Everett
1933 - Establishment of Fifth Division
1991 – Baram renamed Marudi
6th Division - Sarikei
1955, January 1st – Sarikei upgraded to District
1967 – Binatang upgraded to District
1973, April 1st – Julau upgraded to District ; Pakan upgraded to Sub-District within Julau District.
1973, April 2nd – Establishment of Sarikei Division. Sarikei, Binatang, Matu-Daro, Julau Districts and Pakan Sub-Districts, alienated from Sibu Division.
1984, January 24th – Binatang District renamed Meradong District, Binatang town renamed Bintangor.
2002, March 1st – Establishment of Mukah Division. Mato and Daro Districts alienated to Mukah Division.
2002, March 1st – Pakan upgraded to District.
7th Division - Kapit
1973, April 2nd – Establishment of Kapit Division. Kapit, Belaga and Song Districts alienated from Sibu Division.
8th Division - Samarahan
1901 – Sadong District was established, covered Simunjan and Serian.
1955 – Serian upgraded to District. Sadong renamed Simunjan.
1983, August 19th – Muara Tuang upgraded to District. Pekan Muara Tuang renamed Kota Samarahan, and the District named Samarahan.
1986, July 24th – Establishment of Samarahan Division. Simunjan, Serian and Samarahan Districts alienated from Kuching Division. Sub-District Sebuyau from Serian District of Sri Aman Division realigned into Simunjan district.
2002, January 1st – Sub-Districts Asajaya ( Samarahan District ) and Sadong ( Simunjan District ) combined to become a new Asajaya District.
9th Division - Bintulu
1861 – Bintulu ceded to Sarawak
1867, September 8th – First Council Negri meeting held in Bintulu
1978, July 8th – Establishment of Bintulu Development Authority.
1987, January 1st – Establishment of Bintulu Division. Bintulu and Tatau Districts alienated from Miri Division
10th Division - Mukah
1911 – Establishment of Mukah District, within Sibu Division
1973, April 2nd – Establishment of Matu-Daro District within Sarikei Division
1973, April 7th – Establishment of Belawai Sub-District
1987 – Matu became a Sub-District of Daro District
1990, August 8th – Matu upgraded to District
1991, May 5th – Daro upgraded to District
2002, March 1st – Establishment of Mukah Division. Mukah and Dalat Districts alienated from Sibu Division. Mato and Daro Districts alienated from Sarikei Division.
11th Division - Betong
1948, January 1st – Establishment of Saribas District
1948 – Establishment of Kalaka District
1991, January 1st – Saribas renamed Betong,
1991 – Kalaka renamed Saratok
2002, March 26th – Establishment of Betong Division. Betong and Saratok Districts alienated from Sri Aman Division