Municipal Corporation De Facto is a municipal corporation that exists although it has not complied with the statutory requirements like:
1. authorization by a valid law;
2. a colorable and bona fide attempt to organize under the valid law; and
3. an assumption of powers conferred under the law.
Usually, a Municipal Corporation De Facto is established for public good and in good faith to meet the complex situations arising from time to time due to the constant shifting of the bases of municipal organizations. The doctrine of Municipal Corporation De Facto is developed by the American courts from the English doctrine of de facto officers.