The riding is located in north central Edmonton. It was created in 2004 boundary redistribution out of a small part of Edmonton-Manning and most of Edmonton-Glengarry. The riding is named after former Leader of the opposition and mayor of Edmonton Laurence Decore.
The riding has been held by both Progressive Conservative and Liberal representatives since it was created. The current representative is New Democratic Party MLA Chris Nielsen who was first elected in the 2015 general election.
The electoral district was created in the 2003 boundary redistribution from Edmonton-Glengary and Edmonton-Manning. The 2010 boundary redistribution saw the major changes made to the riding.
The western boundary with on 97 Street between the Edmonton city limits and 167 Avenue Edmonton-Castle Downs was moved east to cede land to that constituency. The south boundary with Edmonton-Highlands-Norwood was changed to move along 127 Street instead of the Canadian National Railway tracks. The east boundary saw significant changes as it was pushed eastward to 66 Street into Edmonton-Beverly-Clareview and Edmonton-Manning as far north as 144 Avenue from the railway tracks at 127 Street. The east boundary with Edmonton-Manning was also realigned to run on 66 Street north of 153 Avenue to give some land to Manning.
Legal description from the Statutes of Alberta 2003, Electoral Divisions Act.
Starting at the intersection of 97 Street with the north Edmonton city boundary; then 1. east along the north city boundary to 66 Street; 2. south along 66 Street to 167 Avenue; 3. east along 167 Avenue to the extension of 59A Street; 4. south along the extension and 59A Street to 153 Avenue; 5. west along 153 Avenue to 82 Street; 6. south along 82 Street to the Canadian National Railway (CNR) line; 7. west along the CNR line to 97 Street; 8. north along 97 Street to the starting point.
The electoral district was created in the 2004 boundary redistribution. The first election held in the district saw a hotly contested race between Liberal candidate Bill Bonko Sr. who held prior office as an elected school trustee. He faced incumbent Alberta Alliance MLA Gary Masyk whose district was abolished and former Edmonton-Belmont MLA Walter Szwender. Bonko won the district defeating the two former MLAs and two other candidates.
Bonko ran for a second term in the 2008 general election but was defeated in a hotly contested race by Progressive Conservative candidate Janice Sarich.
On November 19, 2004 a Student Vote was conducted at participating Alberta schools to parallel the 2004 Alberta general election results. The vote was designed to educate students and simulate the electoral process for persons who have not yet reached the legal majority. The vote was conducted in 80 of the 83 provincial electoral districts with students voting for actual election candidates. Schools with a large student body that reside in another electoral district had the option to vote for candidates outside of the electoral district then where they were physically located.