Exhibit 31.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

Under Section
302 of the Sarbanes-Oxley Act of 2002

Regarding
Annual Report on Form 10-K for the Year Ended December 31, 2007

I, Steven A.
Rosso, certify that:

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|1. | I have
  reviewed this annual report on Form 10-K of Pacific State Bancorp.                                                                                                                                                                                                                                       
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|2. | Based on my
  knowledge, this report does not contain any untrue statement of a material
  fact or omit to state a material fact necessary to make the statements made,
  in light of the circumstances under which such statements were made, not
  misleading with respect to the period covered by this report;
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|3. | Based on my
  knowledge, the financial statements, and other financial information included
  in this report, fairly present in all material respects the financial
  condition, results of operations and cash flows of the registrant as of, and
  for, the periods presented in this report;                   
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|4. | The
  Companys other reporting officer and I are responsible for establishing and
  maintaining disclosure controls and procedures (as defined in Exchange Act
  Rules 13a-15(e) and 15d-15(e)) for the registrant and have:                                                                                     

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| | a) | Designed
  such disclosure controls and procedures, or caused such disclosure controls
  and procedures to be designed under our supervision, to ensure that material
  information relating to the registrant, including its consolidated
  subsidiaries, is made known to us by others within those entities,
  particularly during the period in which this report is being prepared;     
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| | b) | Designed such internal control over financial reporting, or caused such
internal control over financial reporting to be designed under our supervision, to provide
reasonable assurance regarding the reliability of financial reporting and the preparation
of financial statements for external purposes in accordance with generally accepted accounting
principles;                      
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| | c) | Evaluated
  the effectiveness of the registrants disclosure controls and procedures and
  presented in this report our conclusions about the effectiveness of the
  disclosure controls and procedures, as of the end of the period covered by
  this report based upon such evaluation; and                                                                                                
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| | d) | Disclosed in
  this report any change in the registrants internal control over financial
  reporting that occurred during the registrants most recent fiscal quarter
  (the registrants fourth fiscal quarter in the case of an annual report) that
  has materially affected, or is reasonably likely to materially affect, the
  registrants internal control over financial reporting.

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|5. | The
  Companys other reporting officer and I have disclosed, based on our most
  recent evaluation of internal control over financial reporting, to the
  registrants auditors and the audit committee of the registrants board of
  directors (or persons performing the equivalent functions):
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|   | a)                                                                                                                                                                                                                                                                                                  | All
  significant deficiencies and material weaknesses in the design or operation of
  internal control over financial reporting which are reasonably likely to
  adversely affect the registrants ability to record, process, summarize and
  report financial data; and
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|   | b)                                                                                                                                                                                                                                                                                                  | Any fraud,
  whether or not material, that involves management or other employees who have
  a significant role in the registrants internal control over financial
  reporting.                                                                                          

Dated:  March 28,
2008

/s/ Steven A.
Rosso 
President and Chief 
Executive Officer

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