Source:

• PESI / Fauna europea
• Bulgarian Cerambycids (E. Migliaccio, G. Georgiev, V. Gashtarov, 2007)
• Inaturalist observations, Facebook group observations and some additional research online

Total count: 287 species
Included are some subspecies that are sometimes considered separate species.
Also included are 11 species that were probably misidentifed when reported from Bulgaria in the early to mid 20th century: Pedostrangalia emmipoda, Vadonia imitatrix, Vadonia steveni, Stenopterus ater, Aegomorphus krueperi, Neoorcadion laqueatum, Dorcadion decipiens, Dorcadion gallipolitanum, Dorcadion litigiosum, Oberea euphorbiae, Phytoecia rufipes.

Also needs additional confirmation:
Parmena pontocircassica - I couldn't find any info for occurance in Bulgaria, but it's listed as "present" on PESI.
Stenopterus atricornis (one observation on Inaturalist in Bulgaria - www.inaturalist.org/observations/50979852)
Xylotrechus smei and Xylotrechus stebbingi are synonyms?

Total count without uncertainties: 273 species

If you find any wrong information on this list please message me.