When it comes to HOA fees, the various amounts has to do with what is included and not included. Example: pool maintenance, landscaping, personnel, utilities, parking, storage space, gym, etc. You need to compare what is included with each HOA community so you can compare apples to apples. As for online listings, there can be mistakes between an accurate amount on the MLS system owned by realtors and what appears on websites like Zillow or Trulia. For this, you need to call a local realtor who can look it up on the MLS system.