The City of Baltimore funded most of the Aquarium's $21.3 million construction cost.
Other major sources include:
- $7.5 million from City capital funds generated by the sale of Friendship (now Baltimore-Washington International) Airport to the State of Maryland;
- another $7.5 million from the 1976 bond issue referendum,
- and $2.5 million from the Economic Development Administration of the U.S. Commerce Department.
The private sector contributed about one million dollars.

