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If there are mistakes in your data for geocoding, there are ways to rectify them.  See the tutorial information on reconciling unmatched and tied addresses for help.

Importing Tab-Delimited (.txt) Files to Excel for Use in ArcMap

1. Open MS Excel
2. Click on the Office button and choose Open.  The Open File dialog box will appear. Find the file you want to open.  You may need to navigate to the place where the file you want to open is stored.
3. Highlight the file you want to open by clicking on it once. 
4. Click the Open button in the bottom, right hand corner of the screen.
5. The Text Import Wizard dialog box will appear.

   Step 1

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1. Use the following settings

• Original data type: Delimited
• Start Import at row: 1
• File origin: 20127: US-ASCII

1. Click Next.

   Step 2

   Use the following settings:

• Delimiters: Tab (with Tab Delimited files.  Other file types and delimiters will vary)
• Text qualifier: "  You may need to change this.  Check the Data preview at the bottom of the screen.  The lines represent columns in an Excel file.  If the text is displaying properly, leave the Text qualifer field as-is.  If the text in each column is not displaying properly, choose a text qualifier from the pull down menu until the text in columns displays in the correct fashion.
  

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• #Click Next

  Step 3

  Use the following settings:
• Column data format: Text
  The default import format is General.  This will convert numeric values to numbers, date values to dates, and remaining values to text.  This is a problem when importing GPS latitude/longitude points or long identifier strings from Census data, because the General format will convert the values in these columns to scientific notations.  To make sure Excel imports all columns as Text, do the following:

1. In the Data Preview, click on the heading of the first column - it should say "General."
2. Scroll the bar over to the far, right side so that the last column in your data set displays.
3. Hold down the Shift key on your keyboard and click the header of the last column.  Release the Shift key.  This should highlight all the columns. 
4. In Column data format, click the radio button next to Text.  This will import all of the columns in text format.
5. Click Finish