Professional license, notary and insurance producer lookups. 3 official sources, linked directly to the government site.
Official attorney roll / bar member search: admission, status and discipline. State bar sites are official regulators in many states. Link goes to the official agency home page; the lookup is linked from there (direct search URL did not resolve in our check).
Official notary commission lookup (status, commission number, expiration). Name, ZIP, status, RON.
State multi-profession license verification portal. Professions covered are listed in the name; most also include boards beyond those named — use the profession filter on the site.