In Jainism, Dev Lok generally refers to the heavenly realms of devas.

• Commonly counted: 12 Devalok
• If the higher celestial realms are also included: 26 celestial abodes in total

- 12 Devalok - 9 Graiveyak - 5 Anuttar Viman

So, the short answer is: 12 Dev Lok, and 26 heavenly realms if counted in a broader cosmological sense.