First, separate two different jobs
Google Maps lets people create and export saved places. Google documents that saved lists can be exported through Google Takeout. That is useful for personal places, but it is not the same job as producing a prospecting list from a category-and-location search.
For lead research, start with a query you can explain: a service category, a city, and a reason the business may need your help. MapsLeadExtractor exports the results of that research as CSV after a full search. Excel then becomes the place where you review, filter, and add notes.
Google Maps Help: create and export saved listsBuild the search before you export it
Pick one market
Use a city, suburb, or service area where you can actually work. A broad country query produces rows without a campaign behind them.
Name one category
Search the service you sell to. "Brake repair" and "plumbers" describe different buyer needs and should not share the same message.
Choose one filter
A missing website, an outdated destination, or a review pattern can start research. Verify the observation before it reaches an email.
Open the CSV in Excel and keep only the fields you can act on
Excel can open CSV files directly, and Microsoft also documents the Data > From Text/CSV import path when you need control over delimiters or column formats. Keep source data intact in one sheet. Put your decision notes in a separate column so another person can see what you verified.
Microsoft Support: import or export CSV files in ExcelBusiness name
Lets you identify the listing later and avoid guessing who a row belongs to.
Category and location
Keeps a search such as "plumbers in Dallas" distinct from the next market.
Phone and website status
Gives you a factual first check before you attempt any outreach.
Reviews and notes
Captures context that you still need to verify by hand.
A list is research, not permission to blast people
Before contacting a business, confirm the listing is current, verify the website status yourself, and write down the specific problem you intend to discuss. Follow applicable outreach and privacy rules, honor opt-outs, and measure results from your own campaigns.