Records do not show up after import through Data Import Wizard

Step 1: Review Import Results in Bulk Data Load Jobs:

Review how many records were imported via Bulk Data Load Job Details. The click-path is as follows:
 

• For Classic: Click on your Name | Setup | Monitoring | Bulk Data Load Jobs or Jobs

• For LEX: Click on Setup | Environments | Jobs | Bulk Data Load Jobs

Now you will need to locate your import Job ID best way is by the Start Time.

Step 2: Calculate Records Created:

Locate 'Records Processed' and subtract 'Records Failed' to determine how many records were successfully created.

Records Failed are typically caused by missing required field data or CSV mapping issues.

Step 3: Review Your CSV File:

It is always best to review your CSV file and look at the fields you have available and required for the object you are importing to. That way you will know if there are any custom fields you need to create in your object or add additional information to your CSV file for your required fields. This is so your records will create and you won't run into any error messages.

Step 4: Verify Records in Lightning:

In Lightning you can also go to the object's tab and click the small dropdown triangle to change the list view from specific object's "Recently Viewed" to "All [object]" (i.e. "All Contacts" if on the "Contacts" tab.) The recently viewed list view only shows the records that you have accessed where as specific object's ALL list view shows all the records which can then be sorted by the date.

If you continue to have issues you may consult Salesforce Support.