The Official Ontario Road Map has continually changed as the decades have passed. The following summarizes some of the more notable changes to the layout and structure of the map. Changes to actual road names and construction is left for those sites that focus more on the highways of Ontario.
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1915 |
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1923 |
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1929-1930 |
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1931-1932 |
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1933 – 1934 |
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1935 – 1936 |
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1936 – 1937 |
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1937 – 1938 |
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1938 – 1939 |
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1939 – 1940 |
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1940 – 1941 |
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1941 | |
1949 |
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1950 |
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1951 |
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1952 |
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1953 |
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1954 |
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1955 |
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1956 |
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1957 |
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1958 |
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1959 |
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1960 |
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1961 | |
1962 |
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1963 |
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